The protrusible rasping organ in a mollusk's mouth that is used to scrape food from the substrate is:
A. a veliger
B. a visceral mass
C. composed of nacre
D. a radula
E. an ammonite
D. a radula
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The HIV genome contains nine genes, and therefore encodes just nine proteins
Indicate whether the statement is true or false
Aerobic training ____
a. makes skeletal muscles more resistant to fatigue b. promotes break down of actin and myosin c. is fueled mostly by creatine phosphate d. produces muscle fibers that fatigue quickly e. makes skeletal muscles become rigid and stiff
Which of the following factors exhibits one of the most striking changes as one crosses the ecotone between communities on serpentine and nonserpentine soils in southwestern Oregon?
A) soil depth B) soil temperature C) soil chromium D) soil moisture
Primates are important in the study of human evolution because:
A. humans are primates B. some primates live in the same environment as humans C. humans evolved from primates D. primates are related to humans