Photosynthesis first occurs on Earth by about

___ years ago.



a. 4.6 billion
b. 3.5 billion
c. 2.7 billion
d. 1.1 billion
e. 0.5 billion


B

Biology & Microbiology

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The metabolic feature that defines Thaumarchaeota is ________.

What will be an ideal response?

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Foreign species that have negative effects on native species are called:a

prey species. b. non-native species. c. invasive species. d. predator species. e. endemic species

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What happens first following a neuronal stimulation?

A. Sodium ions enter the cell. B. Sodium ions leave the cell. C. Potassium ions enter the cell. D. Potassium ions leave the cell. E. Potassium ions are involved in positive feedback.

Biology & Microbiology

Genes each have a ____ that specifies its position on chromosomes

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology