Which of the following is NOT a factor in
moving blood back to the heart?
a. systolic pressure
b. smooth muscle contraction
c. skeletal muscle contraction
d. one-way valves in veins
e. more than one of these is NOT a direct
factor in moving blood back to the heart
A
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Bat wings, human forearms, elephant legs, and
cat forelimbs are what type of structures?
a. analogous structures b. homologous structures c. vestigial structures d. homozygous structures e. heterozygous structures
Which of the following is an organic chemical water pollutant?
A. cyanide B. pesticides C. heavy metals D. chloride ions
One organelle, called a(n) ________, contains enzymes that digest worn out parts of cells.
A. lysosome B. vesicle C. endoplasmic reticulum D. peroxisome
Fossils include rocks and sediments that
A) have been shaped by people to resemble plants or animals. B) bear the impressions or shapes of preserved organisms. C) have been shaped by wind and water to resemble lifelike forms. D) all of the above.