Answer:
D. The digestive system breaks food down into the molecules that can be used in respiration.
Explanation:
I think it’s the first one - a , but I could be wrong
Answer:
The trade-off hypothesis claims that virulence is an inherent result of parasite propagation but this theory has been gradually questioned since the 1990s.
In the nephron, your blood is filtered by the tiny blood vessels of the glomeruli and then flows out of your kidney through the renal vein.