The primary source of new red blood cells in mammals is the ____
a. liver
b. blood, itself
c. spleen
d. heart
e. bone marrow
ANSWER: e
Biology & Microbiology
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Double fertilization in flowering plants refers to ________
a. two sperm fertilizing a single egg b. two sperm fertilizing two eggs c. a single sperm fertilizing two eggs d. a sperm fertilizing an egg and another sperm fertilizing the endosperm mother cell
Biology & Microbiology
Jaws and paired fins evolved in early __________. Fill in the blank(s) with the appropriate word(s)
Biology & Microbiology
Identical twins arise from a split at which stage?
a. the morula b. the blastula c. two cells d. eight cells e. 32 cells
Biology & Microbiology
Changes in the number of copies of chromosomal DNA segments and the genes they contain are called
____________________.Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology