__________ are tiny pores in the epidermis that facilitate the diffusion of carbon dioxide into leaves or
herbaceous stems.
a. Stomata
b. Guard cells
c. Tracheids
d. Sclereids
e. Trichomes
A
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What might be the predominant lifestyle on Earth?
A. omnivory. B. masting. C. herbivory. D. commensalism E. parasitism.
The continuously sparking electrodes in the apparatus used in the Miller-Urey experiment simulated ____
a. solar energy b. lightning strikes c. volcanic eruptions d. radioactivity e. hydrothermal vents
When rats are given high doses of anabolic-androgenic steroids (AAS), they experience ____
a. decreased muscle mass and overall strength b. increased fertility c. increased aggression and anxiety d. increased gonadotropins and gonadal hormones e. decreased sex drive and energy levels
After cell division, some cells become differentiated. This means that they
A. become different shapes. B. become different sizes. C. perform different functions. D. become different in all these ways.