Which of the following is a feature of an endocrine gland?
A. the product of these glands is carried into the lumen of an organ
B. secretes a hormone into a gland or duct
C. they do not respond to a negative feedback system
D. secretes a hormone directly into the bloodstream
E. characterized by the salivary glands
Answer: D
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Human development ____
a. is complete at birth b. begins at puberty c. is complete at puberty d. occurs only during adult life e. begins at conception
Briefly describe how toxic materials like DDT that have low concentrations in the water column affect organisms at distant locations
What will be an ideal response?
Considerable evidence indicates that the null model of community structure is incorrect because
A) each species responds independently of other species to the prevailing physical environment. B) interactions among species have no significant influence on community structure. C) when one species is removed, the populations of the other species are unaffected. D) species interactions modify the fundamental niche of the species involved, influencing their relative abundance and, in some cases, their distribution.
Which of the following is NOT one of the kingdoms included within the Eukarya domain?
a. Archaea b. Plantae c. Fungi