To act as an effective coolant in a car's radiator, a substance has to have the capacity to absorb a great deal of heat. You have a reference book with tables listing the physical properties of many liquids. In choosing a coolant for your car, which table would you check first?
A) pH
B) density at room temperature
C) heat of vaporization
D) specific heat
Answer: D
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The surface area of a plant's root system is substantially larger than the surface area of its shoot system. The extensive surface area of roots is an adaptation associated with _____
A) contact with soil particles for mineral and water absorption B) the internal structure of the vascular tissue in roots C) the storage of nutrients within the root system D) the release of carbon dioxide generated by photosynthesis
Thecosome pteropods are primarily
a. herbivores. b. carnivores. c. detritovores. d. omnivores. e. scavengers.
Based on the above diagram and other information from your text, what is the most likely (e.g., most parsimonious) explanation for the evolution of flight in vertebrates?
A. Wings evolved once in vertebrates (e.g., the common ancestor of all terrestrial vertebrates had wings), and wings were subsequently lost in all but three lineages: bats, pterosaurs, and birds. B. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently three different times: in bats, in pterosaurs and in the common ancestor of birds and dinosaurs. C. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently two different times: once in bats and once in the common ancestor of birds, pterosaurs, and dinosaurs. D. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently three different times: in bats, in pterosaurs, and in birds. E. The common ancestor of all terrestrial vertebrates was wingless, and wings evolved independently three different times: in bats, in birds and in the common ancestor of pterosaurs and dinosaurs.
Which of the following occurs in situations where more than one hormone produces the same effects at the target cell and their combined effects are amplified?
A) antagonism B) permissiveness C) synergism D) summation