In an evolutionary sense, what is meant by the term molecular clock?
What will be an ideal response?
Molecular clocks are amino acid or nucleic acid sequences in which evolutionary changes accumulate over time. Ideally, such changes accumulate at a constant rate, so that the degree of differentiation is correlated to the length of time of divergence.
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Birds are different from all other living vertebrates because they:
A. can fly B. lack teeth C. have feathers D. are bipedal E. All of the choices provided are correct
The vertebrate lung first appeared in ____
a. fishes b. amphibians c. reptiles d. birds e. mammals
Which of the following prokaryotic nutritional
groups use CO2 and inorganic substances to produce energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. none of these
The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called
A) asexual reproduction. B) sexual reproduction. C) regeneration. D) spontaneous generation.