Which of the following describe source-sink metapopulations? (Check all that apply.)A) Sink populations near source populations are less likely to go extinct.B) Sink populations without access to immigrants from source populations are less likely to go extinct.C) Source populations usually occupy better habitats.D) Source populations are less likely to go extinct.E) The emigration rate from source populations exceeds that from sink populations.
What will be an ideal response?
A, C, D, E
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In the northeastern Pacific ocean, sea otters occur at a relatively low abundance. By preying upon sea urchins, sea otters maintain underwater kelp (large algae) "forests", which would otherwise be decimated by the herbivorous sea urchins. The kelp forests supply food for a wide variety of marine organisms, as well as providing refuge from predation and nursery habitat for juveniles. Based on this, what type of species best describes sea otters?
A. indicator species. B. flagship species. C. keystone species. D. dominant species. E. umbrella species.
Answer the following statements true (T) or false (F)
1.The hypothalamus is both part of the central nervous system and part of the endocrine system. 2.ADH has roles in both homeostatic control of water in the blood and in connecting sexual and social behavior. 3.ADH receptors in an appropriate part of the brain lead to rewards, which enhance social behavior in voles. 4.Researchers Pitkow and Young observed altered kidney function and social behavior in voles with extra ADH. 5.Seasonal affective disorder can be treated with supplemental lighting.
Skin color in humans is a(n) ____________________ trait.Fill in the blank(s) with the appropriate word(s)
What can happen if an enzyme is altered, even slightly?
A) It will continue to catalyze reactions, but at a slower rate. B) It will still catalyze reactions, but only at a higher temperature. C) The amount of activator required to "turn on" the enzyme will need to increase. D) Its active site may change, causing the enzyme to stop functioning. E) It will catalyze reactions too quickly, potentially causing illness for the individual.