Sclereids are cells that:a
are found in wood and bark.
b. conduct water and dissolved minerals.
c. are usually found in nut shells and pits of stone fruits.
d. conduct dissolved sugars.
e. form cytoplasmic connections between cells.
c
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All of the following are helminths except ________.
A. trypanosomes B. tapeworms C. flukes D. roundworms E. pinworms
During the first major divergence of life the
atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from anaerobic to aerobic. d. firmly in the age of aerobes. e. all of these.
Giardia lambia is a prokaryotic organism.
a. true b. false
What is the correct rank order for relative toxicity (most to least) of the primary nitrogenous wastes generated by different animals?
A. ammonia ? uric acid ? urea B. urea ? ammonia ? uric acid C. ammonia ? urea ? uric acid D. uric acid ? ammonia ? urea E. urea ? uric acid ? ammonia