One true characteristic of all animals is that they:a
are mobile.
b. have a brain.
c. are heterotrophs.
d. have an organ system.
e. only show sexual reproduction.
c
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The mycorrhizal relationship you studied in a
previous chapter is an example of
a. commensalism. b. mutualism. c. competition. d. predation. e. parasitism
Imagine that you have been assign the task of describing a new mammalian species. You note that this species has mutated so RBCs no longer go through final stage of maturation. Predict how this might affect the species.
A. Red blood cells could improve their oxygen-carrying function. B. Red blood cells would be better able to fight infection in the body. C. Red blood cells could act as stem cells. D. Red blood cells could replicate outside of bone marrow since they retain their nuclei.
Marine cartilaginous fishes overcome water loss to their environments by:
a. having specialized chloride cells in their gills that prevent water loss. b. having specialized chloride cells in their gills that continuously excrete salts. c. storing urea in their body fluids, which causes them to be hypertonic to seawater. d. producing very small quantities of urine. e. drinking large quantities of freshwater
Which of these structures is located under the cerebral hemispheres and is important in sensory experience, motor activity, stimulation of the cerebral cortex, and memory?
A) hypothalamus B) thalamus C) pons D) cerebellum