Phytoplankton are only found at the surface of ocean waters because . a. they feed on tiny organisms living at the surface. . b. they are an important food source to surface-dwelling marine organisms. . c. they require sunlight to carry out photosynthesis. . d. they cannot withstand the colder temperatures of deep water.

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

Adoença vitiligo afeta qual doença do corpo?

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.