Which of the following is considered a likely explanation for the events of the Cambrian explosion?

A) Complex predator-prey relationships and increased atmospheric oxygen levels promoted animal diversification.
B) A great surge of volcanic activity was triggered by significant movements of the continental plates and possibly by an asteroid impact.
C) Solar flares led to increased UV radiation intensity, which in turn promoted a high rate of mutation. This led to rapid diversification of animals.
D) The massive growth of swamp vegetation depleted the atmosphere's carbon dioxide and eventually cooled the Earth's climate.


Answer: A

Biology & Microbiology

You might also like to view...

Which of the following occurs in vascular land plants but not charophytes (stoneworts)?

A) sporopollenin B) lignin C) chlorophyll a D) cellulose E) chlorophyll b

Biology & Microbiology

Members of the lineage ____ include slugs and snails. Most have a shell, but some have no shell. Most

undergo torsion during development, a twisting of their visceral mass that leads to placement of their anus practically over their heads.

a. Cephalopoda b. Polyplacophora c. Bivalvia d. Gastropoda e. Scaphopoda

Biology & Microbiology

Why are viruses not considered to be alive? What will be an ideal response?

Biology & Microbiology

Which of the following is not a reason Rocky Mountain spotted fever should be diagnosed within the first few days of an infection?

A) A schizophrenia-like illness or mood disturbances may result. B) Untreated cases can be fatal in as few as eight days. C) Fatal organ or brain bleeding may occur. D) Limb amputation may be required due to necrosis. E) It may cause blood vessel damage that impacts circulation to the arms and legs.

Biology & Microbiology