The Precambrian supereon, in which life first appeared, and diversified to multicellular eukaryotes, lasted approximately ___ of the geologic timescale

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


85%

Biology & Microbiology

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Cell walls are used by many different organisms for protection from their environment and structural support. These cell walls must obviously be insoluble in water; otherwise, they would dissolve the first time an organism got wet

Which of the following carbohydrates would you expect to be most soluble in water? A) starch B) peptidoglycan C) cellulose D) chitin

Biology & Microbiology

Sking and answering questions about the world in an unbiased manner is referred to as ____

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Biology & Microbiology

Which chemical is responsible for the thinning of eggs from seabirds?

a. Chlorine b. Sewage c. DDT d. PCBs

Biology & Microbiology

Bacteria usually adapt their internal environment to match their external conditions.

A) True B) False

Biology & Microbiology