Formation of ____________________ is an intermediate stage in the development of colon cancer. Fill in the blank(s) with the appropriate word(s)
polyps
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Which of the following statements characterize heterospory?
_____ It involves production of two different types of spores from a single sporangium. _____ It involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. _____ It increases the chance of cross-fertilization. _____ It increases the potential for genetic variation and aids evolutionary flexibility. _____ It occurs in seed plants and seedless vascular plants.
Both the large waves and starvation of marine
mammals was caused by a. El Niño. b. El Diablo. c. El Minator. d. El Laborador. e. none of these.
Osmosis can be defined as ________
A) the diffusion of water across a selectively permeable membrane B) the diffusion of nonpolar molecules across a selectively permeable membrane C) active transport across a selectively permeable membrane D) the diffusion of a solute across a selectively permeable membrane
Urine flows from the collecting duct into the
A) ureter. B) urethra. C) renal pelvis. D) distal tubule.