The energy base on mud flats is:
a. phytoplankton.
b. detritus.
c. marsh plants.
d. algae.
e. chemosynthesis.
B
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Very small and very large human newborns are less likely to survive than those born at an intermediate weight due to
____.
a. sexual selection b. artificial selection c. disruptive selection d. directional selection e. stabilizing selection
In most flowering plants, one sperm nucleus fuses with an egg forming a zygote that develops into an embryo. Another sperm nucleus fuses with ____
a. the endosperm mother cell to produce three cells, each with one nucleus b. the endosperm mother cell, forming a diploid cell c. the endosperm mother cell, forming a triploid (3n) cell d. one of the smaller megaspores to produce what will eventually become the seed coat e. one of the smaller megaspores to produce a diploid endosperm
__________ refers to processes designed to induce immunity. Fill in the blank(s) with the appropriate word(s)
Contraction of the biceps muscle
a. extends the arm. b. extends the leg. c. flexes the arm. d. flexes the leg. e. works with the triceps muscle.