While walking through the forest, you discover a tree covered in shelf fungi. Although you are unable to determine whether the tree is alive, dead, or dying, you know that shelf fungi are potentially pathogenic and may already have caused significant harm to this particular tree. Nevertheless, you resist the urge to knock down these shelf fungi; why?
a. Shelf fungi also cause warts in humans when touched or inhaled.
b. It would release spores that would infect all of the other trees in the area.
c. The shelf fungi will return valuable nutrients to the forest ecosystem.
d. Damaging shelf fungi causes them to redouble their metabolic rate.
c. The shelf fungi will return valuable nutrients to the forest ecosystem.
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A controlled experiment is one in which ________.
A. there are at least two groups, one differing from the other by two or more variables B. there are at least two groups, one of which does not receive the experimental treatment C. the experiment is repeated many times to ensure that the results are accurate D. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data
Which organism would you expect to find preserved as a fossil?
a. a jellyfish b. a shelled arthropod c. an earthworm d. a nematode e. a protistan such as an amoeba
During the ____ period, because their symptoms are declining as they are recovering, many patients stop taking their antibiotics
Fill in the blank(s) with the appropriate word(s).
Evolutionary biologists studying the evolution of lizard horn length found _________.
A. that lizard horn length evolved as a defense mechanism against predators B. that the tools of the molecular biologist could not be applied in a study of lizard horn length C. lizards shedding their horns D. no particular advantage to longer horns