The sex chromosomes determine the sex of mammals and are
A. female, YX; male, XX.
B. female, Y; male, X.
C. female, X; male, XX.
D. female, XX; male, XY.
D. female, XX; male, XY.
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Cells of the immune system are not found in which of the following tissues in the gastrointestinal tract?
A. Peyer's patches B. Tonsils and adenoids C. Appendix D. Tooth enamel
The biome with the most complex diversity is the
a. tundra. b. taiga. c. tropical rain forest. d. desert. e. grassland.
The three types of microscopes used to look at cells and parts of cells are the transmission electron microscope, scanning electron microscope, and ________
Fill in the blank(s) with correct word
Plant roots that are in a horizontal position grow down because
A. auxins are being pulled to the upper side. B. cells on the upper side elongate more than those on the lower side. C. auxins are stimulating cells on the lower side to elongate more. D. auxins are having no influence on this process. E. statoliths are pushing auxins to the upper side.