The neurons in michael's arm just sent a neural impulse. it will be 1-2 milliseconds before another neural impulse can be generated. this brief time period, when another neural impulse cannot occur, is called the

During a quiet eruption, a lava flow may set fire to and then bury everything in its path. true or false

How is the phosphorus cycle different from the nitrogen or carbon cycles?

What type of cellular respiration happens in prokaryotic cells?

How many species do scientist think are on earth

Climatology is a subspecialty of A. marine biology. B. oceanography. C. meteorology. D. environmental science.

How can infectious and noninfectious diseases affect personal health?

Why do the circulatory systems of land vertebrates have separate circuits to the lungs and to the rest of the body?

Reproduction and natural selection work together to drive adaptation. True False

After a strain of bacterial cells is exposed to a chemical mutagen, only 30% of the cells produce new colonies that continue to grow. Which of the following can be concluded? A. Some cells underwent advantageous mutations B.

What units measure the amountsof energy in food