Many of the chemical reactions within a cell occur in the

a endoplasmic reticulum

b mitochondria

c cytoplasm

How can the Hantavirus be transmitted to humans?

Briefly describe the flow of energy among organisms in an ecosystem

What category does a snake fall in

Allopatric speciation is another name for

Western pine forests are?

How did Francesco Redi disprove the idea of spontaneous generation? He showed that flies were not produced by meat. He showed that microorganisms are present in air. He showed that microorganisms cause disease. He showed that flies spread disease.

Of the millions of sperm who start the long journey to the egg, how many sperm are actually allowed to enter the egg?

A mineral leaves a gray trail when scraped against an unglazed porcelain plate. Which property of a mineral is being measured? A. luster B. streak C. color D. hardness

Which two systems in the human body are devoted exclusively to the regulation of organ function?

A 40-year-old man reports to his health care provider complaining of "heartburn" that occurs after eating and also wakens him at night.