The energy base on mud flats is:

a. phytoplankton.
b. detritus.
c. marsh plants.
d. algae.
e. chemosynthesis.


B

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

__________ refers to processes designed to induce immunity. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

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.

Biology & Microbiology