The transfer of food and nutrition from its sources through a series of organism by way of eating and being eaten away is known as
a. food cycle.
b. food chain.
c. food link.
d. nutrition cycle.

What is the problem in this article? what solution does the article propose?

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Select the correct answer from each drop-down menu. the lac operon in e.coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .