How many different substituent groups can be obtained by removing a hydrogen atom from ethane?
A) 1
B) 2
C) 3
D) 4
A
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What are small molecules composed of multiple amino acids called?
A)monomers B)protobionts C)bacteria D)proteinoids E)DNA
Genetic drift refers to ________
A) a change in the overall distribution of a population B) a change in the frequency of a population's genes because of mutation C) a change in the frequency of a species' occurrence D) a change in the frequency of genes in a population because of tectonic plate movement E) a change in the frequency of a population's inherited trait brought about by a chance event
Streamlined eolian erosional landforms that taper in the downwind direction ____
a. have slip faces b. lie at the angle of repose c. are yardangs d. are drumlins
____________________ poisoning, mostly affecting children, can cause mental retardation and brain damage.
Fill in the blank(s) with the appropriate word(s).