Which level includes all the other levels?

A. organisms
B. ecosystem
C. community
D. biosphere
E. population


Ans: D. biosphere

Biology & Microbiology

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Soil mineral particles that range from 0.2-0.02 mm in diameter are called ____

a. fine sand b. humus c. clay d. silt e. coarse sand

Biology & Microbiology

The motor neuron releases acetylcholine into the ____________________ to initiate a muscle contraction. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Which of the following senses involves molecules binding to a receptor surface? 

A. sight B. hearing C. touch D. smell

Biology & Microbiology

Which term refers to the diffusion of water through a semipermeable membrane?

A. facilitated diffusion B. osmosis C. endocytosis D. diffusion E. active transport

Biology & Microbiology