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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____________________ poisoning, mostly affecting children, can cause mental retardation and brain damage.
Fill in the blank(s) with the appropriate word(s).
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