This is the exchange of oxygen and carbon dioxide between an organism and its environment.

Which biome contains both freshwater and salt water? A. lake B. estuary C. river D. ocean

A biologist marked 200 mice, by putting leg bands on them, out of a forest containing an unknown number of mice. The marked mice were then returned to the forest for 6 months to mix thoroughly.

Sewage in the ocean can cause immediate effects in the ecosystem

All but which one of the following is a carbohydrate? A. alanine B. glucose C. maltose D. fructose

In fruit flies the allele for long wings (L) is dominant and the allele for short wings (l) is recessive. What is the likely genotype of a fruit fly with short wings? Either LL or Ll Either Ll or ll Only LL Only ll

Which of the following statements cannot be tested by science?

Can you explain how salt from the sea is returned to the land

A species of rabbit is preyed upon by foxes, which are preyed upon by wolves. Humans decide to open a hunting season on the wolf population.

Nearly all nutrients present in tropical rainforest forests are contained in the

One of the original Amish colonies rose from a ship of colonists that came from Europe. The ship’s captain, who had polydactyly, a rare dominant trait, was one of the original colonists.