Southern sea otters were thought to have been hunted to extinction in early 1900s. a group of fewer than 50 otters were discovered off the coast of central California in 1911. since then, the population has grown to 2800 individuals. Which statement most likely explains how the earlier reduction in genetic variation could affect the future of the southern sea otter? A. it could increase the ability of sea otters to find genetically different mates
B. It could reduce the causes of all types of mutations in the sea otter population.
C. It could increase the amount of competition for resources among the sea otters.
D. It could reduce the ability of the sea otter population to adapt to climate change.

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

What materials must dams have to produce electricity, and what must occur?

Which of the following is the smallest unit that would contain a complete copy of the entire human genome? a) one human somatic cell b) one human chromosome c) all of the dna of one human d) one human gene