The best approximation of the true outer
boundary of the continents is the seaward edge of
a. contirental shelf.
b. mid-ocean ridge.
c. present-day shorelines.
d. ocean trenches.

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis. b. the primary role of microbes on the planet involves causing disease in animals and humans. c. microbes produce vitamins in the intestines. d. microbes play a role in breaking down waste and decomposing dead organisms.

Which description provides the best objective summary of the article in the passage?

Aplant may open end close its stomata to prevent excess water loss and maintain