Since two populations of squirrels were separated and they are both classified as different species, hypothetically saying that they have different characteristics, we could assume that two different species was made by another organism, and not the environment. So the answer is B. Speciation
Different cells have different functions. For example, muscles cells in your arm are different than cells in your skin or brain. This allows for more complex life forms because it allows an organism to do many different things within it
I think it is D
Hope this help you
Answer:
sophisticated irrigation, chemical fertilizers, chemical pesticides
Explanation:
The use of irrigation to provide needed water and the use of natural fertilizers to promote crop growth are farming methods that have been practiced for centuries. More sophisticated irrigation techniques, various chemical pesticides, and modern chemical fertilizers have been developed in the twentieth century.
