Q.18. During which period did the first trilobites appear?
a) Cambrian
b) Devonian
c) Silurian
d) Ordovician

Answers

Answer 1

Answer:

a) cambrian

Explanation:

The first body fossils of trilobites appeared in the Early Cambrian Period, about 540 million years ago.

Answer 2

Answer:

A. Cambrian period

Hope this helps :)


Related Questions

plzzzzzzz help.........

Answers

Answer:

The top right is Protist

The top left is Eubacteria

Explanation:

Researched off reliable websites gimme a brainliest?

What do the organization of systems and homeostasis have in common?​

Answers

They both part of the body

Place the following events in chronological order:

1. Event 1
Internal combustion engine invented in 1876
2. Event 2
Electric light bulb invented in 1879
3. Event 3
Dynamite invented in 1869
4. Event 4
First gasoline powered tractor invented in 1892
5. Event 5
First transcontinental railroad completed in 1869

Answers

Event 5, Event 3, Event 1, Event 2, Event 4 I think!

Answer:

event 1 = dynamite

event 2 = tranckntinal railroad

event 3 = combustion engine

event 4 = light bulb

event 5 = gas powered tracto

Explanation:

HELP ME PLEASE Question 3 of 10
Suppose an actual bird is observed to lay from one to six eggs each week.
Which of the following would be the best method for randomly determining
how many eggs an imaginary bird lays in a simulation?
A. Throwing a dart at a dartboard hanging on a wall at a distance of
10 feet
B. Blindly selecting from a bag filled with blue, green, red, and yellow
beads
C. Drawing from a deck of cards printed with either an uppercase or
lowercase a
D. Rolling a six-sided number cube and using the number on the top
side

Answers

Answer:

D. Rolling a six-sided number cube and using the number on the top side.

Explanation:

I majored in Biology

The best method for randomly determining how many eggs an imaginary bird lays in a simulation would be to roll a six-sided number cube and use the number on the top side. Therefore, option (D) is correct.

What is a simulation?

A simulation is a computer program or model that imitates a real-world system or process. It allows researchers, scientists, engineers, or other users to understand, predict, or test the behavior of a system or process under different conditions or scenarios. Simulations are used in various fields, including engineering, physics, chemistry, economics, medicine, and social sciences, among others.

They often involve mathematical or statistical models, algorithms, and computer graphics or visualizations to represent the system or process being simulated. By running a simulation, users can observe the results, draw conclusions, and make predictions about the behavior of the real-world system or process. Simulations can be helpful in decision-making, experimentation, training, and education, among other applications.

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help me with this if possible

Answers

Answer:

well 5 is easy its the axis

I believe the first one is false

Algae are green plants.
The figure below shows the number of algae in a lake in the United Kingdom during
one year.
number of
algae
Jan
Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
month
Explain the changes in the number of algae in the lake from February to June (3)
ANSWER​

Answers

Answer:

Kindly check explanation

Explanation:

According to the graph given the number of algae is represented on the y axis while the month of the year is represented on the x - axis of the graph. The change in the number of algae from February is clearly depicted by an upward slope along the y-axis which means that there is continous increase in the Number of algae in the lake during this period, that is between February to June . It could also be seen that around June the optimal number of algaae is achieved as the number of algae tend to fall as we move beyond June.

3. How many layers does our skin have? *
3
5
7

Answers

Answer:

3

Explanation:

i looked it up i hope that helped!

What is a single stranded molecule used
to move genetic information from the
nucleus to the cytoplasm?
A. mRNA
B. DNA
C. NNA

Answers

Answer: A)

Explanation: it's job is transportation of genetic info.

hope it helps :)

An element may have more than one isotope if the atoms have different numbers of
A electrons.
B neutrons.
C positrons.
D protons.

Answers

B. Neutrons —///—:/—

What happens when a baby dies in the mothers womb do the docters just take the baby out? Or do they have to do a pressideur?

Answers

Answer:

if the baby is still small you have to take a pill or when the baby is a little big they have to do a procedure.

Explanation:

please help!!!!!!!!!!!​

Answers

I'd say that your traits can come form your parents. if you mean physically

Answer:

everyone is different because of our enviroment

(sound food and health) and we get those traits from our parents.

Hey I am doing school and need someone to talk to

Answers

Answer:

focus on your work

Explanation:

haha nah only jk

What are the major factors that contributed to this species becoming endangered/extinct?

Answers

Answer:

Species become endangered for two main reasons: loss of habitat and loss of genetic variation. A loss of habitat can happen naturally. Dinosaurs, for instance, lost their habitat about 65 million years ago.

Explanation:

Hope this will help

Define simple sugar?

Answers

Answer:

Simple sugars are called monosaccharides, made up of single sugar molecules.

Explanation:

Examples of these are glucose, fructose, and galactose. When two simple sugars are joined together by a chemical bond they are called disaccharides, the most common of which is sucrose or table sugar

answer a sweet, crystalline substance, C12H22O11, obtained chiefly from the juice of the sugarcane and the sugar beet, and present in sorghum, maple sap

Explanation:

If one strand of a DNA molecule has the sequence
5'-TTCCGGAT-3', what is the sequence of the
other strand of DNA? If RNA is transcribed from
the 5'-TTCCGGAT-3' strand, what would be its se-
quence? And if RNA is transcribed from the other
DNA strand, what would be its sequence?

Answers

Answer:

DNA pair

3' AAGGCCTA 5'

RNA from original is

3' AAGGCCUA 5'

RNA from new strand

5' UUCCGGAU 3'

Explanation:

Rosa drew a diagram to compare substitution mutation and insertion mutations. What label belongs in the area marked "Y"?

Answers

Answer:

Hey There!

_____________________________________

Answer:

_____________________________________

Mutations:

Mutations are the changes produced in the nucleotide sequence of the genome.

There are four main types of mutations

Substitution

Insertion

Deletion

Duplication.

_____________________________________

DELETION:

A small segment of chromosome mat be missing. This condition is known as deletion.

For example, Normal chromosome has A B C D E F G. If deletion mutation occurs then mutated chromosome has A D E F G and B C got deleted.

_____________________________________

DUPLICATION:

In this condition, a part of chromosome present in exec ess to the normal chromosome.

For example, Normal Chromosome has A B C D E F G. If duplication mutation occurs, then mutated chromosome had A B C B C D E F G and B C is duplicated.

_____________________________________

SUBSTITUTION MUTATION:

Substitution is a type of mutation where one base pair is replaced by a different base pair.

For example, in the sequence CAAGT, if C replaces G, it is a substitution mutation.

INSERTION MUTATION:

In genetics, an insertion is the addition of one or more nucleotide base pairs into a DNA sequence.

For example, in the sequence CAAGT, if extra base G gets inserted after C, the new sequence would be CGAAGT.

_____________________________________

Both substitution and insertion mutations change the position of nucleotide thus, the type of amino acid. Option A is correct because B and D are wrong as increase in number of bases and decrease in number of bases is because of deletion and duplication mutations here it asks for substitution and insertion mutations. C is wrong as In mutation there is always a change in bases or chromosome. So all the other choices seem incorrect as it is asking for substitution and insertion the base pair changes which results in the change in type of amino acid.

_____________________________________

Best Regards,

How long does it take a bone to become a fossil?

Answers

Answer:

Fossils are defined as the remains or traces of organisms that died more than 10,000 years ago, therefore, by definition the minimum time it takes to make a fossil is 10,000 years.

Explanation:

Which of the following is the complimentary DNA strand for the sequence shown below?

ACT GCA
Please explain, if possible.

Answers

UGA CGU, the complimentary DNA strand would be the mRNA stand

The complimentary DNA strand for the sequence ACT GCA is TGA CGT​.

What is DNA?

DNA stands for deoxyribonucleic acid which is defined as a polymer made up of two polynucleotide chains which coil around each other to form a double helix.

Primarily DNA is located in the cell nucleus called nuclear DNA, but a small amount of DNA can also be found in mitochondria called mitochondrial DNA or mtDNA, so mitochondria are structures within cells that store energy from food that converts into energy.

The information in DNA is stored in the form of code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T) which are bond to each other by hydrogen bond like A with T with 2 hydrogen bonds while C with G with 3 hydrogen bonds. Like for above given information,  ACT GCA complimentary strand is TGA CGT

Thus, The complimentary DNA strand for the sequence ACT GCA is TGA CGT​.

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Is the genetic material is made of protein?

Answers

NOOOO! Don’t believe those 1900s lies! The genetic material of life is DNA!

please help, I really need a good grade I'm currently failing. ​

Answers

Answer:

B

Explanation:

all motion requires an opposite force

If a parent cell has 6 chromosomes, how many chromosomes will there be during mitosis before the cell divides?

Answers

Probably like 4 or 3 right? I’m not sure good luck:)

Male cones produce ______ which contains cells that develop into sperm.

(For people who need the answer)

Pollen

Answers

Answer:

yeah i was gonna say pollen cuz no one else had the right answer

Explanation:

Answer:

Yes the answer would be pollen

Explanation:

Which one of the following is the name for the way cells divide in asexual reproduction?
Twins
Mitosis
Meiosis
Generation Square

Answers

Answer:

Mitosis

Explanation:

When a eukaryotic cell divides asexually, the nucleus and its genetic contents must divide too, in a process called mitosis. Both haploid (n) and diploid (2n) cells can divide asexually, at which time their nuclei divide mitotically.

Which species have become extinct in modern times?

Answers

Answer:

Dodo.

Great Auk.

Stellers Sea Cow.  

Tasmanian Tiger.  

Passenger Pigeon.  

Pyrenean Ibex.

Baiji White Dolphin.  

West African Black Rhinoceros. The West African Black Rhinoceros was found in several countries towards the southeast region of Africa

Explanation:

Answer:

dodo, and many others such as saber tooth tiger

Explanation:

they have been extinct because of climate change and sea levels

Energy that is transferred in waves or particles. Energy from the source.
A. Radiation
B. conduction
C. convection

Answers

Answer:

A.Radiation is the answer

someone please helppp!

Answers

Answer:

D) the presence or absence of a Nucleus

Explanation:

A Nucleus is present in a Eukaryotic cell. A Nucleotide is present in a Procaryotic cell. If there is a nucleus present, it is a Eukaryotic cell

Conduction can only occur between two objects when –

Answers

Answer:

Conduction can only occur between two objects when -

one object is less dense than the other. both objects are in physical contact with each other.

HELP Help please

How can one system be considered a compound of another system?

Answers

Answer:

A

Algebra For what values of the variables must ABCD be a parallelogram?

B

23. A 2y + 2 B 24. B

(3x + 10)

(8x + 5)º

3x + 6

54°

D

С

D

A

Зу - 9 с

ly+4

Helppp pleaseeeeeee!!!!

Answers

first one is correct i’m pretty sure lmk if it’s wrong :)

dash is a flexible tissue which produces new blood cells inside the bone​

Answers

Answer:

Marrow

Explanation:

The bone marrow, is a component of the lymphatic system, and is the soft flexible tissue in the cavities of bone.

The answer would be a Marrow
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