1. Polymerization (the formation of polymers) is a process that
a. creates bonds between R groups in the forma-
tion of a polypeptide.
b. involves the removal of a water molecule in a
dehydration reactions to
c. links the nitrogenous base of one nucleotide
with the phosphate of the next.
d. may involve all of the above.

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Name the organs of humanelemintary canal.

Variety of living organisms; includes genetic, species, and ecological types.