The most recent mass extinction on Earth:
a. happened 65 million years ago when dinosaurs became extinct
b. was 248 million years ago when Pangea formed
c. is going on now and is due to human activities
d. happened 544 million years ago during a period of massive glaciation
e. occurred 360 million years ago, when 70% of marine groups were lost
c
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What is vertical transmission of viruses?
a. an infection transferred between species b. an infection transferred from plant to plant c. an infection inherited from a parent organism d. an infection caused by mutated proteins
If a flood separated a large population into two populations, this would be an example of which
process?
a. allopatric speciation b. development of a host race c. parapatric speciation d. polyploidy e. sympatric speciation
Which statement about digestion in ruminants is FALSE?
a. Ruminant animals have symbiotic bacteria to aid in the digestion of their food. b. Food materials are re-chewed. c. Chewing results in mechanically breaking down food and exposing more cellulose to digestive enzymes. d. Ruminants have a smaller range of foods in their diet than do humans. e. Ruminants have a single but disproportionately large stomach.
The replacement model is supported by
evidence from a. the fossil record. b. DNA sequencing data from mitochondria. c. DNA sequencing data from chromosomes. d. global climate change patterns. e. all of these.