Answer:
B
Explanation:
The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.
Maybe, not sure, may need to check yahoo answers for this one
Answer: biodiversity
Explanation: it makes sense as the best answer from all the choices, could be wrong tho lol
Answer:
Natural selection. It is simply the process by which random variations that give an individual a favorable adaptation to its environment survive to be passed on to offspring.