An organ is made up of several
a. biological molecules.
b. organ systems.
c. tissues.
d. cells.
e. organisms.
C; Although a and d could also be considered to be correct, c is the best answer because it is the level of organization immediately below organ in terms of complexity.
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When the gasoline molecule shown in this figure is broken down and used, what form does the energy take?
a. free
b. potential
c. kinetic
d. activation
Which soil region is the most fertile soil layer where the roots of most herbaceous plants are located?
a. A horizon b. B horizon c. C horizon d. D horizon e. O horizon
Nonvascular plants lack _____
a. spores b. gametes c. zygotes d. seeds e. chloroplasts
Population control factors that arise from outside the population are called
A. extrinsic limiting factors. B. density-independent limiting factors. C. intrinsic limiting factors. D. density-dependent limiting factors.