A good hypothesis must
A. be a logical explanation of events.
B. be testable.
C. account for all current information related to the events being studied.
D. All of these statements are true.
D. All of these statements are true.
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Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the nuclear pores are open. B. while the proteins are being assembled. C. after the cell is dead. D. while the DNA is being copied into RNA. E. during cell division.
The process by which a small balloon is used to widen a narrowed blood vessel is called balloon ________
Fill in the blank(s) with correct word
Which of the following statements is true of the pine life cycle?
A) The pine tree is a gametophyte. B) Male and female gametophytes are in close proximity during gamete synthesis. C) Conifer pollen grains contain male gametophytes. D) Double fertilization is a relatively common phenomenon.
The ____ of a human population is the average number of children born to a woman during her reproductive years.
A. global reproductive rate B. mean reproductive rate C. average fertility rate D. total fertility rate E. replacement fertility rate