When a cell is in equilibrium with its environment, which of the following occurs for substances that can diffuse through the cell?
A) There is random movement of substances into and out of the cell.
B) There is directed movement of substances into and out of the cell.
C) There is no movement of substances into and out of the cell.
D) All movement of molecules is directed by active transport.
Answer: A
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Which of the following is defined as "all of the various species living in the same area?"
Community Ecosystem Population Organism
The baleen whale which carries the most barnacles is the
a. right whale. b. sperm whale. c. gray whale. d. orca. e. blue whale.
What is the evidence that genes are involved in a white-crowned sparrow learning to sing?
A. If the sparrows are deafened after learning to sing, they will sing abnormally as adults. B. If they do not hear singing from other white-crowned sparrows, they will eventually learn to sing normally. C. If they hear singing from both white-crowned sparrows and other species of sparrows, they will sing abnormally. D. If they do not hear singing from other white-crowned sparrows, they will sing, but abnormally. E. If they do not hear singing from other white-crowned sparrows, they will not sing at all.
The biological species concept is based on the idea that individuals in one group are be unable to breed with individuals outside their group. This phenomenon is referred to as ________
Fill in the blank(s) with correct word