Which of the following is the main point of the study of guppies in Trinidad?
a. Predators can affect life history patterns
b. Killifish and cichlids eat guppies.
c. Guppies that share habitat with killifish grow faster.
d. Life history patterns immediately return to normal once predators are removed.
a
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Numerous hypotheses have been proposed for the mass extinction of about 60% of all species, including nearly all the dinosaurs, about 65 million years ago. Evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate about why the dinosaurs subsequently became extinct.
What will be an ideal response?
Fishes that exhibit a sedentary lifestyle have ____ bodies
a. fusiform b. laterally compressed c. globular d. flattened e. streamlined
If you wanted to cause the extinction of an entire phylum, you would need to kill every cycad.
Indicate whether the statement is true or false.
In the United States, approximately how many urinary tract infections occur annually?
a) 1 million b) 8 million c) 10 million d) 25 million