Which of the following is not a reason why estuaries are important?

they provide a nursery for many types of fish
they are the least polluted areas of the ocean.
they are extremely productive
they are great for transporting goods for manufacturing and trade
they control flooding by acting as a buffer

Babies with very low or very high weight are less likely to survive .

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.