The first living organisms appeared on Earth approximately

a. 4.6 billion years ago.
b. 3.8 billion years ago.
c. 1 billion years ago.
d. 6400 years ago.


b

Biology & Microbiology

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A mature maple tree can have a mass of 1 ton or more (dry biomass, after removing the water), yet it starts from a seed that weighs less than 1 gram. Which of the following processes contributes the most to this huge increase in biomass?

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Fill in the blank(s) with correct word

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