The first complex multicellular life forms with appendages, etc., appeared on Earth about 0.5 billion years ago during the
a. Jurassic Period.
b. Mississippian Period.
c. Cambrian Period.
d. Precambrian Period.
e. Neolithic Period.
c
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Which structure or compartment is part of the symplast?
A) the interior of a vessel element B) the interior of a sieve tube C) the cell wall of a mesophyll cell D) an extracellular air space E) the cell wall of a root hair
A nonliving object that can spread infection is a ________
Fill in the blank(s) with the appropriate word(s).
In the human heart, ____.
A. ventricle walls are more thickly muscled than the atrial wall. B. atrial contraction helps to drive blood circulation throughout the body. C. the right ventricle has thicker walls than the left ventricle. D. the left ventricle pumps blood to the lungs. E. the atrial walls are as thick as the ventricle walls.
Sexual reproduction is important to the survival of a species in a changing environment because
a)sexual reproduction requires less overall energy expenditure than asexual reproduction. b)sexual reproduction produces genetically different individuals. c)sexual reproduction requires only one individual. d)sexual reproduction produces genetically-identical individuals. e)All answers are correct.