Name three natural sources of calcium carbonate?

When does dna replication(make a copy of itself)?

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature about 37 degrees celsius (98.6 degrees f)? describe what might happened the temperature decreased by 10 degrees celsius.

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems