Why is RNA necessary to act as a messenger? Why can't the code be taken directly from the DNA? How do some cells become brain cells and others become skin cells when the DNA in ALL the cells is the same? In other words, if the instructions are the same, how does one cell become a brain cell and another a skin cell?

idk man just give me points

Explanation:

answer; i believe the correct answer is ( proteins );

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

i didn't have the answer choices , but i tried my best.