The greatest annual input and least seasonal variation in solar radiation occurs in the
A) Southern Hemisphere.
B) temperate zones.
C) tropics.
D) polar regions.
Answer: C
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The presence of altruistic behavior is most likely due to kin selection, a theory maintaining that _____
A) aggression between sexes promotes the survival of the fittest individuals B) genes enhance survival of copies of themselves by directing organisms to assist others who share those genes C) companionship is advantageous to animals because in the future they can help each other D) critical thinking abilities are normal traits for animals and they have arisen, like other traits, through natural selection E) natural selection has generally favored the evolution of exaggerated aggressive and submissive behaviors to resolve conflict without grave harm to participants
True or false: if a DNA molecule is visualized as a wood screw from a hardware store, the threads in the screw are spaced identical distances from each other
A. true B. false
Epidermal cells secrete a coating called the ____ that protects the plant from water loss and attacks by
microbes.
a. cuticle b. protoplast c. stoma d. trichome e. bark
Examine Type 4 hypersensitivities by completing the sentence. Type 4 dysfunction is known as ______________ hypersensitivity for symptoms arise one to several days following secondary antigen exposure.
A) Xenografts B) Delayed C) Autografts D) Contact dermatitis E) MHC 1 F) T G) Tuberculin H) Allografts I) GVHD J) Type 4