Your job is to classify a newly discovered animal species. Your initial studies reveal that your specimen has tissues, organs, and a head; has no body cavity or segmentation; and has bilateral symmetry. To what phylum does this animal belong?
A) Cnidaria
B) Mollusca
C) Annelida
D) Platyhelminthes
E) Porifera
D
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What characterizes nekton? a. Ability to swim strongly against currents
b. All of these choices. c. Relatively high consumption. d. Highly productive organisms.
What environmental factor seems to have the most impact on deep-sea, benthic organisms?
a. Low temperatures b. Extreme pressure c. Food availability d. Perpetual darkness
What is the sudden withdrawal of one's hand from a hot stove?
A) learning B) common sense C) an instinct D) a reflex
The minimal amount of nutrients needed every day by healthy people to prevent nutrient deficiencies is called the
A) RDA, Recommended Dietary Allowance. B) minimum mineral requirements. C) minimum vitamin requirements. D) varied diet of minerals and vitamins.