Purple sea stars are found in the pacific ocean. they prey on common mussels, suppressing the mussel population in the intertidal zone of the pacific northwest. by controlling the mussel population, sea stars enable the ecosystem to support other invertebrates. experimental data suggests that purple sea stars are a keystone species in the intertidal zone of the pacific northwest. what will most likely happen to this ecosystem if the purple sea star is permanently removed? a. invertebrates in the area will undergo rapid speciation. b. vertebrates in the area will assume the role of preying on mussels. c. mussels will dominate the area, causing a net decrease in biodiversity. d. other starfish will migrate to the area and establish themselves in the purple sea star's place.

What kind of action is a cause of air pollution

All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more cells.

Awoman whose sister tested positive for a specific mutation in the brca1 gene, which increases the risk for breast and ovarian cancer, is found not to have that mutation but does have a mutation of unknown significance near the known mutation site. how should this woman be counseled? select one: a. she should be informed that her risk for breast cancer is greater than the general population but not as great as her sister’s risk. b. she should be informed that because she does not have the mutation, her risk for breast cancer is not greater than that of the general population. c. she should be informed of her gene mutation status and be presented with all the available prophylaxis options and reconstruction options. d. she should be informed that she does not have the specific mutation but that because another mutation is present she should be vigilant about screening