Which plant is consumed by more people
worldwide than any other plant?
a. wheat
b. corn
c. rice
d. potatoes
e. legumes
C
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Research has shown that commercial fisheries place selective pressure on fish populations by
harvesting mostly the ____ fish, resulting in ____.
a. young; aging populations b. larger; maturity at smaller sizes c. smaller; maturity at larger sizes d. prereproductive; declining birth rates e. postreproductive; no change in population size
Declining amphibian populations are correlated with
a. habitat loss. b. introduction of new species. c. long-term changes in climate. d. fungal infections and parasitic diseases. e. all of these.
The first step in the prevention of blood loss from an injured vessel is ____
a. platelet plug formation b. increased blood flow c. coagulation d. clot retraction e. vessel spasm
In autumn, the leaves of deciduous trees change colors. This is because chlorophyll is degraded and _____
A) carotenoids and other pigments are still present in the leaves B) the degraded chlorophyll changes into many other colors C) water supply to the leaves has been reduced D) sugars are sent to most of the cells of the leaves