The hormone oxytocin stimulates contraction of:
A. the smooth muscles in the walls of blood
vessels
B. the muscles of the stomach wall
C. uterine muscles
D. skeletal muscles
C
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Once a scientific theory becomes a law, it
A) cannot be changed. B) cannot be challenged. C) becomes static. D) is subject to modification. E) is irrefutable.
What is the main determinant of biome distribution?
a. vegetation type b. climate c. ocean currents d. elevation e. weather
In Darwin's time, natural selection was thought to be primarily negative. However, we have since learned that positive selection is a powerful force, and it
A) creates new gene variants that enhance the phenotype. B) retains gene variants or combinations that promote successful reproduction. C) enables people to resist infectious diseases. D) enables us to alter our genotypes.
The scientific name for the black-footed ferret is Mustela nigripes. The name Mustela indicates the ____________ to which this organism belongs
a. class b. family c. genus d. phylum e. species