Which statement best defines biodiversity?

a) the total number of different species in an area

b) the number of communities in an ecosystem

c) the number of tropic levels in a food web

d) the total size of a population of a single species

How does the structure of a type of human tissue relate to its function in the body?

If people planted huge numbers of trees and plants, how might the carbon dioxide levels in the graph above change

state one reason why a glucose molecule is more likely than a sucrose molecule to diffuse through an artificial membrane

In the same mouse species, a third unlinked gene (gene C/c) also has an epistatic effect on fur color. The presence of the dominant allele C (for color), allows the A/a and B/b genes to be expressed normally.

Why is the beaker kept out of sunlight when water is is it?

If the human population continues to grow, what is a likely effect on land use? A. More land will be used for forests. B. More land will be used for grasslands. C. More land will be used for wetlands. D. More land will be used for agriculture.

What gives each amino acid its unique properties? its side group, its amino group, its carboxyl group, it sequence

In Mendel's experiment with round - and wrinkled-seed plants, the F1 plants, which produced only round seeds, were grown up andmatured and were allowed to self-fertilize. What was the ratio of round to wrinkled seeds in the F2 generation?

What are idea models designed to do? What is one drawback of using idea models?

Which scientific tool would be most useful for collecting organisms that live in a stream