An atom that normally has __________ in its outer shell would NOT tend to form chemical bonds with other atoms.
Fill in the blank(s) with the appropriate word(s).
Answer: eight electrons
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The theory of endosymbiosis explains:
A. the reason for the human biome. B. the mutually beneficial relationship between two organisms, both of which are capable of living independently. C. how bacteria came to inhabit the human intestine. D. the origin of mitochondria and chloroplasts.
Which of the following statements about global warming and the greenhouse effect is correct?
A. The greenhouse effect can lead to global warming. B. Global warming and the greenhouse effect describe the same phenomenon. C. Global warming and the greenhouse effect are not related. D. The greenhouse effect refers to heat that escapes Earth's atmosphere, whereas global warming refers to heat that is trapped by Earth's atmosphere. E. None of the answer options is correct.
The diapsids diverged into the lepidosaurs and the archosaurs. From which of these groups did the snakes arise?
a. archosaurs b. neither of these groups c. lepidosaurs d. There are species of snakes from both of these groups.
Referring to the above diagram, which
structure is responsible for secreting digestive enzymes into the small intestine and hormones into the blood?
a. D b. E c. F d. G e. A