In humans, implantation occurs
A) just prior to fertilization.
B) when the embryo is a gastrula.
C) when the zygote is a blastocyst.
D) after the formation of the neural tube.
E) immediately after fertilization.
C
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Which of the following mechanisms is NOT used to encourage the movement of water over gills?
a. cilia b. contraction of the diaphragm c. contraction of a muscular mantle d. a fish swimming with its mouth open e. contractions of body muscles
Angiosperms have two types of xylem tubes, each composed of one cell type, either ____ or ____
a. vessel elements; companion cells b. sieve elements; companion cells c. sieve elements; tracheids d. vessel elements; sieve elements e. vessel elements; tracheids
Human reproductive cloning produces a newborn human that is genetically identical to another adult
human. _________________ Indicate whether the statement is true or false.
In double fertilization, one sperm fuses with the egg, and the other sperm fuses with the two antipodal nuclei. Indicate whether the statement is true or false