Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called
A. oncogenic.
B. latent
C. delta agents.
D. viroids.
E. prions.
Answer: B
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Callaway and Aschehoug's study concluded that an invasive Eurasian grass species can outcompete native North American grasses through
A. secretion of allelochemicals. B. producing more viable seeds. C. producing seeds year-round. D. anti-herbivore compounds. E. faster seed germination.
The odontophore of molluscs is part of the:
a. digestive system. b. nervous system. c. excretory system. d. defense system. e. reproductive system.
Which ponds contained only killifish as predators?
a. primero and quinto b. segundo, tercero, and sexto c. tercero and quinto d. quarto, sexto, and septimo e. none of the above (all ponds containing killifish also contained cichlids)
Native grasslands of North America, influenced by declining precipitation from east to west, consist of three main types distinguished by the ________ of the dominant species
Fill in the blank(s) with correct word