Biochemical systems within the stigma of a flowering plant prevent the pollen from a different species from developing a pollen tube and fertilizing its eggs. This is an example of what kind of reproductive isolation?
A. pre-zygotic, behavioral isolation
B. pre-zygotic, temporal separation
C. pre-zygotic, lock and key
D. post-zygotic, temporal separation
E. post-zygotic, ecological separation
C
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During adaptive radiation one species adapts to form several additional species quickly. Before speciation occurs, the original species can be termed as which of the following?
a. parent species b. novel species c. first species d. found species
Which structure do numerous mollusks use to scrape algae off rocks?
a. chelicerae b. pupa c. radula d. beak e. shell
Which of the following arises from the mesoderm?
a. pituitary gland b. inner layer of skin c. chorion d. outer layer of skin e. lining of respiratory system
A primary reason that the kidneys have one of the highest metabolic rates of all body organs is that _____
A) they have membranes of varying permeability to water B) they operate an extensive set of active-transport ion pumps C) they are the body's only means of shedding excess nutrients D) they have an abundance of myogenic smooth muscle