Early seed plants were pollinated by:
a. butterflies.
b. bees.
c. birds.
d. box turtles.
e. wind.
Ans: c. birds.
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What is population variation?
a. variation between two adjacent populations b. variation that results from two populations mixing and interbreeding c. the distribution of phenotypes among individuals in a population d. a gradient of change from one edge of a population to the other
An instrument that magnifies slight differences in the refractive index of cell structures is called a (n) ________ microscope.
A. phase-contrast B. densitometric C. electron D. fluorescence
The instrument used to measure blood pressure is called
a. a sphygmomanometer. b. a hemocytometer. c. a hematocrit centrifuge. d. none of the above.
Mitochondria and chloroplasts have genomes that have evolved from the nuclear genomes in eukaryotes
Indicate whether the statement is true or false