Prior to 500 million years ago, organisms were
unable to venture onto land because
a. the earth’s crust was too hot.
b. the land was too dry.
c. there was not enough oxygen in the atmosphere
for respiration.
d. the land was not shielded from the sun’s
ultraviolet radiation.
e. there was no organic matter on land for food
Answer: d
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A. Fix, smear, stain B. Smear, fix, stain C. Fix, stain, decolorize D. Smear, decolorize, stain
What type of thinking is required?
What will be an ideal response?
The actual niche the organism is able to occupy in the presence of competitors is called its
A. fundamental niche. B. realized niche. C. interference niche. D. intraspecific niche. E. exploitative niche.
How do viruses make copies of themselves?
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