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