The streamlined bodies seen in sharks, tuna, and dolphins best relate to
A. a recent shared common ancestor.
B. dissimilar selection pressures.
C. the physical properties of water.
D. the need to escape fast-moving predators.
E. intelligent design.
C. the physical properties of water.
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Microorganisms that live on dead and decaying organic material are known as
A) indigenous microflora. B) parasites. C) pathogens. D) saprophytes.
It has been proposed that the first living organisms were:
a. heterotrophs. b. autotrophs. c. chemosynthetic. d. photosynthetic. e. multicellular.
The primary photosynthetic pigment molecule, chlorophyll a, is an orange pigment.
a. true b. false
Which of the following represents a potential threat to biodiversity?
(a). People construct artificial reefs to support marine life. (b). Humans clear land for agriculture and housing. (c). Energy flows through an ecosystem, with much lost as heat. (d). Tropical rain forests and coral reefs are found where solar energy is the most abundant. (e). In a food chain, one population feeds on another.