Features that contributed to success on land include a __________ that protects spores. Fill in the blank(s) with the appropriate word(s)
sporangium
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Once an egg has been fertilized, what event(s) are crucial for preventing additional sperm from inserting chromosomes into the egg?
A. the acrosomal reaction B. the cortical reaction C. the fast block to polyspermy D. both the acrosomal and cortical reactions E. both the cortical reaction and fast block to polyspermy
Bone tissue is hard because its matrix contains
a. collagen. b. iron. c. several minerals. d. calcium salts. e. elastic fibers
The wide-ranging effect of a single gene is called
a. heterozogosity. b. homozygosity. c. segregation. d. pleiotropy. e. co-dominance.
The menstrual cycle and ovulation are coordinated
A. so that ovulation occurs when the uterus has a thick lining. B. because hormones produced by the uterus stimulate the ovary. C. by changes in body temperature. D. None of the above is correct.