What term defines varieties or populations of human beings distinguished by physical traits such as hair, eyes, skin color, and body shape?

a. class

b. cohort

c. ethnicity

d. race

Why does a fox need to be in an ecosystem that includs grass?

If waif wastewater-containing phosphates from laundry detergents made its way into waterways, such as streams and rivers how would that affect the water cycle?

Steel that is exposed to water and salt rusts quickly. if you were a shipbuilder, how would you protect a new ship? explain your answer.

Assume at present that the birth rate of the human population equals the death rate. which population characteristic can best be used to make predictions about future changes in population size? ib 105

Describe how photosynthesis and cellular respiration are cyclical.

What would happen to the mass of a cell in a hypertonic, isotonic and hypotonic?

How do air and water movement, and land masses affect the climate

Under what circumstances does membrane transport always require energy?

What is one disadvantage of using plasma gasification to detoxify hazardous waste?

Euglena use which structure for movement? A. cilia B. flagella C. pseudopods D. they do not move