The membrane of a gas vesicle is composed of
A) various phospholipids.
B) proteins.
C) carbohydrates.
D) both glycoproteins and phospholipids.
Answer: B
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The differences between males and females of a species are called ________
A) sexual morphism B) male/female dimorphism C) sexual differentiation D) sexual dimorphism
Cattle egrets follow African ungulates such as African buffalo around and catch insects that the buffalo flush out. Oxpeckers perch on the backs of buffalo and feed on ectoparasites that infest the buffalo. Which one of the following shows the ecological interaction that the buffalo has with each bird?
A. cattle egret: commensalism; oxpecker: mutualism B. cattle egret: commensalism; oxpecker: commensalism C. cattle egret: mutualism; oxpecker: mutualism D. cattle egret: competition; oxpecker: mutualism E. cattle egret: mutualism; oxpecker: commensalism
Gene flow is NOT a requirement of natural selection.
a. true b. false
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