Phocids congregate in harems during the mating season
Indicate whether the statement is true or false
false
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Nematodes and rotifers have a body cavity that is
(a) called a coelom. (b) called a pseudocoelom. (c) completely lined by tissues derived from mesoderm. (d) both a and c.
Your friend wants to know why birds such as boobies and birds of paradise have elaborate mating rituals. You explain that:
1.Behavioral rituals are a way to keep a bird from breeding with the wrong species, since the rituals are specific to each species. 2.Birds are social and need a way to attract a mate. 3.Birds have evolved mating rituals as methods to display their elaborate and beautiful plumage. 4.Mating rituals have evolved to keep males from mating with more than one female.
Which gland responds to light and is involved in daily rhythms in some animals?
A) Pineal B) Adrenal C) Thymus D) Pancreas E) Pituitary
It has been argued that cutting old-growth forests and replacing them with plantations of young trees would help to alleviate the threat of global greenhouse warming. What important fact does this argument ignore?
A) Forests play too minor a role in global CO2 dynamics, which are affected far more by marine algae. B) Young trees fix carbon at a lower rate per unit mass than old trees. C) Most of the biomass of the cut trees would be added to the atmosphere as CO2 within a few years. D) Most of the young trees would die within a few years.