Answer:
C
Explanation:
If you have more than one variable then you wont know which variable caused the change. Hope this helped, if it did give it a thanks or whatever.
Answer:
D
Explanation:
Its d I think tell me if it's wrong If it is I'm sorry
the killer whales would die of starvation as they would have no source of food, and the cod would become overpopulated. The krill would be scarce, and the algae would over grow.
I hope this helps
Answer:
Photosynthetic organisms were making oxygen, but it reacted with the iron dissolved in seawater to form iron oxide minerals on the ocean floor, creating banded iron formations. ... The oxygen that is now in the Earth's atmosphere was not there at the beginning.
Explanation:
If you are supposed to get your answer from the passage, one could gather that you need to maintain a healthy lifestyle to keep you growing so that these genes are not diminished, a leading factor in cancer.