The group of animals with an efficient respiratory system, in that there is no "stale air" after exhalation, is the:
a. amphibians
b. birds
c. mammals
d. reptiles
e. fish
b
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A(n) ________ lives on or within the host organism for some period of its life
Fill in the blank(s) with correct word
Ethylene oxide is
A. used as an antiseptic against anaerobes. B. sporicidal. C. only effective with high heat. D. a halogen. E. the active agent in household bleach.
Which environment is ideal for plant cells, and which is best for animal cells?
a. isotonic for plant cells, and hypertonic for animal cells b. isotonic for plant cells, and hypotonic for animal cells c. hypotonic for plant cells, and isotonic for animal cells d. hypotonic for plant cells, and hypertonic for animal cells
Unripe fruits protect seeds from predation and early germination. What is the major function of ripe fruits?
A) attracting pollinators B) dispersing seed C) releasing nutrients to seeds D) keeping the seed hydrated before germination