Many mammals have skins and mucous membranes that are sensitive to phenolic secretions of plants like poison oak (Rhus). These secondary compounds are primarily adaptations that _____
A) favor pollination
B) foster seed dispersal
C) decrease competition
D) inhibit herbivory
D
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The Panamanian golden frog is in decline from what specific threat?
A. a virus B. a fungus C. an introduced competitor D. a new road E. overharvesting
Where do cold ocean currents generally occur?
a. along the west coast of continents b. near the poles c. near the equator d. along the east coast of continents e. in the open ocean
During muscle contractions
1.the myofibrils shorten. 2.the actin and myosin filaments slide over each other. 3.the actin filaments move toward the middle of the sarcomere, and then move away on relaxation. 4.the muscle thickens. 5.all of the choices
A protonema
a. is part of the sporophyte generation of a moss. b. is the product of spore germination of a moss. c. looks very much like a filamentous brown alga. d. produces the sporophyte when a bud grows from it