Species that usually colonize empty habitats are more likely to show traits that are favored by _____
a. r-selection b. K-selection
A
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Often the growth cycle of one population has an effect on the cycle of another. As moose populations increase, for example, wolf populations also increase
Thus, if we are considering the logistic equation for the wolf population, dN/dt = rN, which of the factors accounts for the effect of the moose population? A) r B) N C) rN D) K E) dt
Plant cells called ____ form the protective coat around seeds
a. sclerenchyma b. tracheids c. collenchyma d. parenchyma e. vessel members
__________ results in an early embryo that has two
or three primary tissue layers. Fill in the blank(s) with the appropriate word(s).
Exotoxins differ from endotoxins in that exotoxins
A) are composed of lipopolysaccharides. B) are stable at 60°C. C) cannot be converted to toxoids. D) are secreted from living cells.