Which of the following neurotransmitters is associated with sleep, mood, attention, and learning?
A) acetylcholine
B) epinephrine
C) serotonin
D) endorphins
C
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The middle portion of a leaf that is sandwiched between the upper and lower epidermis is called the:
a.mesoderm. b. middle lamella. c. mesophyte. d. bundle sheath. e. mesophyll.
Nephridia are the paired structures used in excretion in
A. planarians. B. humans. C. insects. D. earthworms.
Antigen-antibody complexes trapped in tissues and triggering complement activation or mast cell degranulation are characteristic of
A) type I hypersensitivity. B) type II hypersensitivity. C) type III hypersensitivity. D) autoimmunity. E) graft rejection.
A small group of mice are released on an island without mice but with abundant food for mice and no predators. Initially, the growth of the mouse population will be limited mainly by what?
A. only density-dependent factors B. only density-independent factors C. the biotic potential D. the carrying capacity