During which phase of the cell cycle do the chromosomes align in one plane at the center of the cell?
A) interphase
B) prophase
C) metaphase
D) anaphase
E) telophase
C) metaphase
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Two boys are on a camping trip and need birch bark to start their cooking fire. They cleanly remove a six-inch strip of bark from around the entire circumference of the trunk. Explain what eventually will happen to this tree
What will be an ideal response?
Mitochondria use respired oxygen as an electron acceptor in the process known as:
a. pulmonary ventilation. b. cellular respiration. c. external respiration. d. internal respiration. e. anaerobic respiration.
When oxygen became part of the atmosphere, it came from
A. carbon dioxide. B. volcanoes. C. the splitting of water by autotrophs. D. organic molecules.
One species of fish feeds in the muddy bottom of a lake. A second species eats insects that land on the water surface. This is an example of
A) mechanical incompatibility. B) behavioral isolation. C) ecological isolation. D) geographic isolation. E) temporal isolation.