Which of the following is a density-independent factor limiting human population growth?
A) social pressure for birth control
B) earthquakes
C) plagues
D) famines
E) pollution
Answer: B) earthquakes
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A(n) __________ produces pollen grains
a. anther b. carpel c. filament d. style
High-intensity training in racehorses results in ____
a. the expression of genes involved in energy metabolism, insulin response, and muscle inflammation b. the expression of genes involved in metabolism, oxidative phosphorylation, and muscle structure c. no phenotypic or biochemical changes d. no change in the expression of genes, but changes in phenotypes e. changes in the expression of genes, but no changes in phenotypes
An example of an animal with a long digestive tract and molars with large, ridged surfaces is a ____
a. cat b. deer c. dog d. shark e. tiger
The mature male gametophyte is produced
A. in the pollen tube when the generative cell divides. B. within the pollen granule during transfer. C. within the ovule just prior to fertilization. D. in the anther. E. when the pollen makes contact with the stigma.