What is one mechanism through which increased density may cause infant mortality in mammals?
A) reduced social contact causes stress
B) reduced seed bank causes a decrease of feed for infants
C) increased stress increases infant size
D) high stress environments may reduce lactation
D
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Some bacteria are metabolically active in hot springs because _____
A) they are able to maintain a lower internal temperature B) high temperatures make catalysis unnecessary C) their enzymes have high optimal temperatures D) their enzymes are completely insensitive to temperature E) they use molecules other than proteins or RNAs as their main catalysts
The __________ is a sedimentary cycle; Earth’s
crust is the largest reservoir, and there is no major gaseous form. Fill in the blank(s) with the appropriate word(s).
One advantage to being an ectotherm is that an ectotherm
a) can reduce its body heat by sweating b) needs less energy to maintain homeostasis c) can generate its own body heat d) can survive easily in colder climates
The organism in the accompanying figure belongs to which group?
a. excavates b. alveolates c. stramenopiles d. green algae e. rhizarians