The early Earth's reducing atmosphere probably contained all of the following except
A. carbon dioxide.
B. water.
C. oxygen.
D. hydrogen sulfide.
E. methane.
C. oxygen.
Biology & Microbiology
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Which taxa contain the largest number of known species?
A) coleoptera B) plants (embryophytes) C) fungi D) crustaceans
Biology & Microbiology
Explain how the structure of a leaf contributes to the function of photosynthesis. What will be an ideal response?
Biology & Microbiology
Birds produce species-specific songs
Indicate whether the statement is true or false
Biology & Microbiology
Two closely related species that fail to recognize the courtship behavior of each other are said to be ________ isolated.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology