What happened during the Cambrian explosion?
A. Animals first evolved from single-celled organisms.
B. There was a large asteroid impact.
C. There was a rapid diversification of animal forms.
D. Many large volcanoes erupted.
Answer: C
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When two species contain identical or nearly identical molecules such as proteins, this suggests
A) genetic modification has occurred to the populations. B) the two species share a common ancestry. C) the two species are in fact only one species displaying divergent evolution. D) the two species are in fact only one species displaying convergent evolution. E) the two species overlap in niches and likely share a common diet.
Acacia trees often have ants that live on them. The ants feed on materials produced by special structures called nectaries, which the tree produces. The ants will attack other animals that begin to feed on the tree and will even cut off small branches of other trees that come in contact with "their" tree. The relationship between Acacia trees and ants is called
A. mutualism. B. competition. C. predator/prey. D. parasite/host.
Which type of roots are also known as prop roots?
A. Adventitious roots B. Aerating roots C. Aerial roots D. Contractile roots E. Coarse roots
The genomes of viruses are very small because
A. small genomes are an adaptation that allows for faster copying. B. viruses have evolved only recently. C. of codon bias D. Both small genomes are an adaptation that allows for faster copying and many viruses utilize the molecular machinery of their host cells. E. many viruses utilize the molecular machinery of their host cells.