It's D, Without plants for the grasshopper to eat they would begin to decrease in population causing a decrease in mice population from the lack of food supply and so forth for the snake.
The answer is B (speed up chemical reactions).
Answer: Option A.
Charles Darwin proposed the theory of natural selection as a mechanism of evolution.
Explanation:
Charles Darwin was an English naturalist that lived between 1809 and 1882. He proposed a theory of evolution and natural selection. The theory states that all living organisms came from and develop through the natural selection of small, inherited variation that increase individual's ability to compete, survive and reproduce.
It begins to kill the host's white blood cells. The white blood cells (or T cells) are responsible for killing off viruses and protecting the immune system, so when the AIDS virus kills the T cells the immune system begins to fail. :)
