Why are nonnative species often considered a disturbance in an ecosystem? A. They increase mutations.

B. They compete for resources.

C. They have special growth needs.

D. They cause increased biodiversity.

Which description provides the best objective summary of the article in the passage?

How do water’s relative densities as a solid and a liquid differ from that of most other substances? water’s solid and liquid forms have different densities, while most other substances have solid and liquid forms with similar densities. water’s solid and liquid forms have similar densities, while most other substances have solid and liquid forms with different densities. water’s liquid form is less dense than its solid form, while the opposite is true of most other substances. water’s solid form is less dense than its liquid form, while the opposite is true of most other substances.

Genes that come together with different alleles are heterozygous. homozygous. genotype. segregated.