All ecosystems

A. are entirely self-sufficient.
B. None of the answer choices is correct.
C. need a source of external energy.
D. stay exactly the same once mature.
E. consist of only living organisms.


C. need a source of external energy.

Biology & Microbiology

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A) purified bacterial DNA. B) bacterial endotoxin derivatives. C) heat-killed Bordetella pertussis cells. D) diphtheria toxoid.

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The loudness of a sound depends on the ____ of the sound wave

a. wavelength b. amplitude c. frequency d. type e. substance

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Fibrous structures with three "arms" some archaea use for attachment to surfaces are (fimbriae/hami/pili)

What will be an ideal response?

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T or F: The two types of osteoblasts are osteocytes and osteoclasts

What will be an ideal response?

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