The main center for control of the internal environment of the body takes place in the .
a. adrenal glands
b. thyroid gland
c. cerebellum
d. hypothalamus and pituitary
e. medulla

The earth consists of a variety of different organisms. despite their diversity, however, some similarities on the structural and metabolic levels may be seen. these similarities can be attributed to a. similarities among organisms in their proteins and nucleic acids. b. the ability of organisms to readily adapt to sudden environmental changes. c. similarities in organisms' habitats and niches. d. the ability of all organisms to interbreed and produce new species.

Contrast how pollination is different among gymnosperms and angiosperms.

Of your good in bio kusing a series of preliminary observations; pstate a problem developed from these observations, formulate a hypothesis, design an experiment to test the hypothesis