Organisms that produce all of their offspring in a single event are
A. always successful.
B. never successful.
C. autogenous.
D. semelparous.
E. iteroparous.
D. semelparous.
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__________ are free-living and usually kill their prey. Fill in the blank(s) with the appropriate word(s)
Recent successes in gene therapy are attributed to the _____
a. focus on germ-line gene therapy, rather than somatic gene therapy b. development of improved vectors c. sequencing of the human genome d. improvements in prenatal testing techniques e. improvements in gene doping
All of the following are functions of the extraembryonic membranes except:a
protecting the embryo. b. making food available to the embryo. c. eliminating wastes from the embryo. d. keeping the embryo dry and warm. e. obtaining oxygen for the embryo
To limit water loss, land plants developed
A) stomata. B) a cuticle. C) flowers. D) vascular tissue. E) lignin.