Evidence supporting the lack of oxygen on early Earth includes _____

a. the presence of early photosynthesizers
b. the immediate breakdown of organic molecules
c. the lack of iron oxidation on ancient rocks
d. the presence of iron oxidation on ancient rocks
e. the accumulation of ozone


ANSWER: c

Biology & Microbiology

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Which of the following is NOT considered to be a key derived morphological innovation within the

vertebrate lineage?

a. neural crest cells b. notochord c. bone d. vertebrae e. cranium

Biology & Microbiology

Beckwith-Wiedemann syndrome results from abnormalities of ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

The reaction below represents a ____ reaction.



A. dehydration synthesis
B. hydrolysis
C. unbalanced
D. equilibrium

Biology & Microbiology

Voluntary muscle control is one of functions of the

A) cerebellum. B) cerebrum. C) spinal cord. D) brain stem. E) meninges.

Biology & Microbiology