African elephants once existed in large populations across the African continent. Elephants use their tusks to dig for water and food. Humans hunt and kill elephants for their tusks. Habitat loss and fragmentation have also reduced the total number of elephants and the size of elephant herds. Scientists estimate that the number of African elephants has decreased from several million to several hundred thousand. Population sizes range from over 100,000 individuals in Botswana to approximately 100 individuals in northern Cameroon. Scientists have also found that the frequency of elephants that never develop tusks is increasing.
Select all the statements that describe probable effects of poaching and habitat fragmentation on clephant evolution
a. The elephant population in Botswana will experience high levels of genetic drift.
b. The poaching of elephants for their tusks is leading to the evolution of tuskless elephants.
c. Having tusks does not provide a selective advantage to African elephants.
d. Habitat fragmentation leads to decreases in population size and increases in genetic drift.
e. The elephant population in Cameroon will experience high levels of genetic drift.

Answer:

Option D

Explanation:

In habitat fragmentation, a large ecosystem or habitat of any species is converted into small ecosystems in such a way that each small ecosystem remains isolated from each other. Being isolated , random genetic drift comes in picture and reduces the gene flow with in the isolated habitats.

Hence, option D is correct

Explain why the study of fossils is important to scientists.

After transcription has occurred the mRNA will leave the nucleus and find its way
to the which organelle

1 point
4. Identify Layer 1 of the Earth
1

What is the most superior upper body muscle?

WILL GIVE BRAINLIEST
The hipbone of a snake is an example of

A.an analogous structure

B.a tertiary structure

C.a Vestigial structure

D.a homologous structure

What type of relationship with a bird a fish a tiger and deer have?

Suppose you are given an unknown solution and you need to test its pH. The pH meter is broken, and all you have is the indicator bromothymol blue to use. You add two drops of bromothymol blue to 10 mL of your unknown, and the solution turns a bright yellow. Which of the following is the best estimate of the pH of the unknown solution?
a. 8.5
b. 11.5
c. 1.5
d. 7.0

Alex accidentally left a bag of carrots in the warm car. When he found them, they had
wilted and were soft. He decides to place them in a container of water and check on
them every half-hour or so for several hours. Predict what will happen to the carrots and
why​

What is a group called that does not have anything changed

At the end of a sunny day, Cindy turns on an electric fan to cool off her room. When she turns off the fan a little later, she notices that the area around the motor is warmer than it was when she turned on the fan. What is the most likely explanation for this?

1.Electrical energy was transformed into heat and energy of motion.


2.Solar energy was transformed into heat and energy of motion.

3.Solar energy was transformed into electrical energy and heat.


4.Electrical energy was transformed into sound and light.

mRNA Codon chart Using the above chart, name the amino acid that is coded for by a strand of DNA: CCA O Alanine O Arginine Isoleucine O Proline​

Create a list of at least five expenses you would have to pay if you were going to raise a sheep for one year. You can assume that the land and the barn are available and focus just on the cost of raising a sheep. You do not need a dollar amount for the expenses; just identify what items should be included in the budget.

What are the muscles used to push a heavy cart in front of you? which are primary and which are synergist?

If a flower is wilting, which structure inside its cells lacks water?


vacuole

cell wall

carpel

chloroplast

Consider the following goal: Your students have been learning about different mammals. You would like to have different students become experts on a particular system within mammals (e.g. circulatory, respiratory, reproductive, etc) and share that knowledge with the class. Which cooperative learning model is likely to be most successful in reaching this goal

Are viruses composed of cells?

How do whales differ from fish
A) whales use blowholes for breathing
B) whales have scales that cover the skin
C) whales develop lungs following metamorphosis
D) whales reproduce through external fertilization

PLS HELP IM IN A TEST

crickets determine their sex in offspring with the X0 system. If a female cricket has 22 total chromosomes, including autosomes and sex chromosomes, the male must have ______ total chromosomes

A) 23
B) 22
C) 11
D) 21

state zeroth law of thermodynamics​

please help me im timed and will give brainiest:(​

What percentage of people are likely to have mutations in their DNA?

Which of the following contributed to the Indian Ocean tsunami disaster that occurred in December 2004?
A)
The earthquake that caused the tsunami was the largest earthquake ever recorded.
B)
Most of those killed lived in India, where buildings were not constructed to withstand the forces of the wave.
C)
Levees built to withstand tsunamis failed due to poor construction.
D)
There was no tsunami warning system in place in the Indian Ocean at the time.

does coal releases carbon dioxide into the atmosphere?​

Dolphin fins and shark fins:

a.
are an example of convergence.

b.
are an example of divergence.

c.
suggest these two populations could interbreed.

d.
are evidence that adaptive evolution is mainly driven by random forces.

e.
None of the above is correct.

2. A man has type A blood and his wife has type B blood. A physician types the blood of their four children
and finds that each of the children has a different blood type. What are the genotypes of the parents? How
would you explain that all four blood types could be represented by these four children?

WILL GIVE BRAINLIEST

Theodosius Dobzhansky discovered that successful species tend to have
a wide variety of genes that do not appear to be useful to the species in
its present environment. What did this discovery help explain about
genetics and the changes that occur in a species over time?

A. Species in a stable environment are more resistant to a changing environment

B. Species with greater genetic diversity adapt more easily to changing
environments.

C. Changing environments prevent species from adapting and surviving.

D.Environments with more organisms tend to have more successful species.

Describe hurricanes and the impact they
can have.

Around the world, scientists have found matching fossils, landforms, and
continental shelves. Mid-ocean ridges and trenches were discovered on
the
Together these findings serve as evidence
that Earth's surface is made up of moving.

What shape is used in Model 1 to represent an A antigen?

Please answer the question under