Which statement about early embryonic development in humans is FALSE?
a. The embryo is moved along the oviduct by ciliary action and muscular contraction.
b. The embryo develops through the blastula stage while floating free in the uterus.
c. The embryo enters the uterus about 24 hours after fertilization.
d. Early division of the embryo occurs in the oviduct.
e. Implantation of the embryo occurs about seven days after fertilization.
c
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Which part of the eye regulates the amount of light that reaches the retina?
a. fovea b. cornea c. iris d. lens
____ helps defend plants against viral infection
a. Systemin b. Jasmonates c. Brassinosteroids d. Methyl salicylate e. Oligosaccharins
Cells are involved in the process called ____________ immunity. Activated B cells become ____________ cells which produce ____________ . T cells are involved in the ____________ immune response, directly interacting with their target cells.
Fill in the blank(s) with the appropriate word(s).
Which is not an element found in living matter?
a) water b) hydrogen c) carbon d) oxygen e) nitrogen f) phosphorus