__________ is mostly water in which diverse ions and molecules are dissolved. Fill in the blank(s) with the appropriate word(s)
Plasma
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Polyvalent vaccines using vaccinia virus are highly favored by doctors and physicians but are especially challenging for those who develop them, because
A) coat proteins form a relatively rigid structure and do not allow much space for additional proteins to be expressed. B) multiple foreign proteins simultaneously synthesized often disrupts each other's activity. C) vaccinia and most other viruses engineered for vaccines contain only one restriction site for cloning in their genome. D) virus genetic manipulation uses transfection, which is an inherently inefficient process.
The Earth’s orbit shifts approximately every
___ years.
a. 1,000 b. 10,000 c. 100,000 d. 1,000,000 e. 1,000,000,000
Many introduced species have deleterious
effects on communities and ecosystems because a. coevolved parasites and competitors are absent. b. the introduced species are long-lived. c. predators prefer the introduced species; therefore, the local prey proliferate to dangerously high levels. d. the communities from which they came lost an important predator, competitor, or parasite. e. all of these occur
Which situation is an example of behavioral isolation?
A) A species of daisy only blooms when nights become longer than nine hours. B) The offspring of horses and donkeys are sterile. C) The pollen of roses isn't recognized by the eggs of morning glories. D) Female spiders only mate when a male of the same species taps her web in a particular way.