A prologue of a book is an example of a message. a.
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b.
channel
c.
source
d.
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This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

What is the molar mass of a gas that has density of 2.054 g/l

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse