Chemical compounds secreted by mammals and insects to communicate sexual readiness are called
a. pheromones.
b. developers.
c. hormones.
d. testosterones.
e. estrogens.
A
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Frigatebirds have been observed to pirate food by:
a. perching on feeding pelicans and then stealing fish. b. beating and jostling boobies in flight, forcing them to regurgitate their food - then seizing it. c. preying on other birds. d. both a and b. e. both b and c.
____ bacteria are found inside the roots of legumes, where they receive _____ from the host plant
a. Thermophilic; water b. Cyanobacteria; minerals c. Nitrogen-fixing; carbohydrates d. Methane-producing; minerals e. Halophilic; carbohydrates
The human voice is generated by air moving through the _____
a. pharynx b. glottis c. epiglottis d. pleura e. trachea
Which is the dominant greenhouse gas leading to global warming?
A) CH4 B) H2O C) NO2 D) CO2