Which of the following is an incorrect statement? a. digestive tracts have 2 openings, which allows food to move in 2 directions.
b. gastrovascular cavities have a single opening through which animals both ingest food and expel wastes.
c. extracellular digestion is the process in which food is broken down outside cells in a digestive system.
d. intracellular digestion happens when animals digest food inside specialized cells that pass nutrients to other cells by diffusion.

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

How do you know that the plant cells in these two images have different jobs, or functions? a. because all plant cells serve different functions b. because they are two different colors c. because their dna are different d. because their structures are different