Exercise lasting longer than about 4-5 minutes is mostly aerobic.
a. true
b. false
a. true
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The “ruling reptiles”
a. dominated the land for 125 million years. b. coexisted with ichthyosaurs. c. coexisted with turtles and tuataras. d. lost many lineages in a mass extinction that ended the Jurassic. e. did all of these.
The covalent bond attaching two amino acids is called a ____________ bond. Fill in the blank(s) with the appropriate word(s)
Which of these adaptations to a terrestrial existence evolved most recently?
A) vascular tissue B) seeds C) lignin D) cuticle
Which of the following attributes makes species more vulnerable to anthropogenic extinction?
A) species attractive as human resources B) species that have evolved in the absence of predation and disease C) species with limited geographic range D) species with restricted habitat distribution E) all of the above