__________ covers and protects the outer surfaces of primary plant parts. Fill in the blank(s) with the appropriate word(s)
Epidermis
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Which one of the following gases was not a component of the simulated atmosphere in the Miller-Urey experiment?
A. hydrogen B. water vapor C. oxygen D. methane E. ammonia
An airborne chemical that is used to communicate with members of the same species is called a ____
Fill in the blank with the appropriate word.
Scientists are always thinking about ways to
improve experimental design. In the text's potato chip experiment, which of these might do so? a. show a different movie b. exclude teenagers as group members c. collect uneaten chip remains and weigh them for both groups d. provide free drinks e. use a smaller theater
The presence of the strongest competitors in the
center of a group of animals may qualify the group for status as a(n) a. altruistic society. b. selfish herd. c. kin group. d. dominance hierarchy. e. sexual selection society.