Which of the following features are found in invertebrates that enable them to exchange nutrients and gases without the use of a circulatory system?
A. exposure of the cells to the external or internal environment
B. trilobed gastrovascular cavity
C. coelomic fluid within the body cavity
D. All of these features enable invertebrates to exchange gases and nutrients without a circulatory system.
Answer: D
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Which of the following groups are mollusks?
A. Bivalves B. Gastropods C. Cephalopods D. All of the above are groups of mollusks
A stamen is
a. composed of a stigma, a style, and an ovary. b. the mature male gametophyte. c. the site where microspores are produced. d. part of the vegetative phase of an angiosperm. e. none of these.
Bones are held together at joints by
a. tendons. b. intercellular junctions. c. ligaments. d. cartilage. e. collagen.
Which agent of evolutionary change occurs when a population's allele frequency is altered due to chance?
A. genetic drift B. gene flow C. nonrandom mating D. natural selection