The reason phytoplankton have to live in shallow ocean water is because they cannot withstand the colder temperatures of deep water. they are an important food source to surface-dwelling marine organisms. they require sunlight to carry out photosynthesis. they feed on tiny organisms living at the surface.

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.

Match each medication with its description.

Explain why scientists use the word dominant for certain traits.