True/false. Tropical rain forests cover a small part of the plant, yet they contain more species of plants and animals than all other biomes combines.

Which of the following is a benefit of urban development a. creation of jobs b. fragmentation of habitats c. loss of diversity d. loss of agricultural land

During binary fission, each copy of the duplicating chromosome moves to opposite ends of the cell. What does this achieve?

Which of these are functions of the female reproductive system but not the male reproductive system? Check all that apply.

Which is a polyatomic ion? Mg2 NH4+ Na+ O2-

For what do scientists use data from a controlled experiment

2. The heart is classified as a (n)

How long does it take for cocaine to leave out your Stream

Why is the tundra treeless? lack of sufficient water permanently frozen ground winters too harsh too many fires

Select the correct statement about antigens. A. One antigen may have many different antigenic determinants and may therefore cause the formation of more than one antibody. B. Only small antigens exhibit reactivity. C.

Which molecule is the source of basic material used for the production of glucose in the calvin cycle?