A ________ species is fundamentally essential to an ecosystem; its loss changes the structure of the entire community, even though it may only represent a small portion of the population

A) rivet B) keystone C) redundant D) footprint E) baseline


B

Biology & Microbiology

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Most ocean currents flow clockwise in the Northern Hemisphere

Indicate whether the statement is true or false.

Biology & Microbiology

Of the organisms studied, which group has the

most species found to be threatened?

a. fishes b. angiosperms c. mammals d. amphibians e. insects

Biology & Microbiology

Which muscles are found in the walls of small blood vessels and airways?

a. cardiac and smooth b. cardiac and skeletal c. smooth and skeletal d. only skeletal e. only smooth

Biology & Microbiology

When electrons flow through the electron transport system from NADH to oxygen, what is the sequence of molecules through which they move?

A) complex I, cytochrome c, complex III, coenzyme Q, complex IV, O2 B) complex I, coenzyme Q, complex III, complex IV, O2 C) complex I, coenzyme Q, complex IV, cytochrome c, O2 D) complex I, coenzyme Q, complex III, cytochrome c, complex IV, O2 E) complex II, coenzyme Q, complex III, complex IV, O2

Biology & Microbiology