Answer:
a cell takes in DNA from outside the cell then the external DNA becomes a component of the cell's DNA.
Explanation:
When u need a question answered you click on the camera or you could even type it but I like the camera and u just take a picture of the problem and then u go to the most recent ones that have the correct question on it and scroll down and see the answers but for me I check if there are more than 2 answers of the same one before answering it.
I believe the answer you're looking for is cellular respiration.
The variety of all life forms on Earth.