The base of the pyramid is built from organisms that primarily

A) are autotrophs.

B) are heterotrophs.

C) consume organisms located above them.

D) are heterotrophic, primary consumers.

Organisms that are what related are placed on branches that are close together in a tree of life

Cells of the nervous system, including the brain, rely less on blood sugar (glucose) for energy than do other body cells.

What leads to long-term immunity in mammals? A. Exposure to an antigen B. Action of an antibody C. Barriers

Why do cells contain only a small amount of ATP?

Explain how traits are inherited via meiosis?

Aquaculture cannot reduce the number of fish caught in the wild. a. True b. False

Why does the reporter have a tube up his nose? to accurately measure core temperature True or False

Charles Goodyear was a scientist who was looking for ways to keep rubber from melting in the summer heat and becoming brittle in the winter cold. He discovered the solution by accident when someone left a sample of rubber and sulfur on the stove.

Discuss why scientists know so little about Precambrian Earth

If two elements are in the same chemical family then what can be predicted about their Spectra