Degradation of organic matter is influenced by ________.

A. nutrient availability
B. the nature of the microbial community present
C. abiotic conditions
D. All of the choices are correct.


Answer: D

Biology & Microbiology

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An anthropologist discovers the fossilized heart of an extinct animal. The evidence indicates that the organism's heart was large, was well-formed, and had four chambers, with no connection between the right and left sides

A reasonable conclusion supported by these observations is that the _____. A) animal had evolved from birds B) animal was endothermic and had a high metabolic rate C) animal was most closely related to alligators and crocodiles D) species had little to no need to regulate blood pressure

Biology & Microbiology

Which one of the following enabled eukaryotes to evolve complex life cycles and programs of multicellular development?

A. binary fission B. complex patterns of gene regulation C. a dynamic cytoskeleton D. sexual reproduction

Biology & Microbiology

Before they enter the blood stream, what

modification occurs to erythrocytes?

a. they are loaded with ant-bacterial compounds b. they lose their nucleus and other organelles c. they absorb oxygen and release carbon dioxide d. they are wrapped in a double plasma membrane e. they absorb nutrients and expel wastes

Biology & Microbiology

The sliding filament model

a. supplies the energy needed for muscle contraction. b. provides a flexing action for the muscle fibers. c. describes the action of the actin and myosin in a muscle cell. d. explains muscle fatigue. e. only explains how muscles contract, not how they relax.

Biology & Microbiology