Homeostasis maintains various levels within a narrow range only if environmental conditions do not fluctuate much
a. true
b. false
Answer: b. false
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Sensory neurons release glutamate and neuropeptides such as __________ to enhance the effect of
glutamate. a. GABA b. substance P c. serotonin d. norepinephrine e. adrenalin
Members of which group are not deuterostomes?
A. vertebrates B. echinoderms C. arthropods D. chordates
Native Americans planted crops of corn, squash, and beans. The beans increased the level of nitrogen in the soil. The corn required high levels of nitrogen and provided a support for the beans to climb and receive more sunlight
The large leaves on the squash shaded the ground and limited weed growth. This agricultural method A) caused mass extinctions. B) reduced the ecosystem services. C) is a type of sustainable agriculture. D) increased the number of pests in the fields. E) created wildlife corridors.
In a population of birds where there is an evolutionary stable strategy (ESS) with respect to foraging (feeding) behavior, what is an example of the strategies we might observe when they are feeding?
A. All of the birds in the population always start fights if another bird gets too close, or all the birds always share food, give or take a few rare instances. B. Some of the birds might start a fight if another gets close, and others will share their food with a neighbor. C. On some days, all of the birds start a fight if another gets close, and the other days they all share their food with a neighbor.