Answer:
A
Explanation:
If the track is 400m and he runs around 4 times, then he runs 1600m. (400x4)
<span>The statement "Around 50000 rainforest species go extinct every year." is true. The principle essential reason for animal extinction in latest circumstances has been, with no sensible uncertainty, human request, either for creature assets specifically or for the regular assets constituting the creatures' living spaces.</span>
To increase the size of the tomatoes, one thing he could do is to prune side stems. These are the new branches that grow from the main stem of the plant which signifies overgrowth. Overgrowth will mean that these leaves will not get enough sunlight to grow bigger and also it weighs down the plant. However, when you take out these side stems more of the leaves are exposed to the sun thus they make more energy for the plant which then produce larger fruits.
Natural selection lead to different species when the squirrels were separated, some of them acquired traits better suited for their new environment. This allowed them to survive and reproduce better than others. Over time, each group evolved to display unique traits for their different environments until one species evolved into two.
Explanation:
The speciation in the squirrels due to the barrier in canyon occurred due to this. Such speciation is called allopatric speciation.
Speciation leads to formation of new species from the existing species due to change in their habitat or physical structure.
The squirrels on the two different side of canyon adapted to the habitat they are in. Their reproductive cycles, habitat and adaptation mode has become different due to the change in environment.
The species of squirrels became two as they reproduce and passed on the traits for survival in the environment which they had adapted.
The squirrels have become <em>reproductively isolated</em> also.
Genetic divergence takes place due to natural selection as squirrels arenow two different species.