Why are emperor penguins considered a species?
a. they all look alike.
b. they can mate and produce offspring that can mate.
c. they can mate and produce offspring that cannot mate.
d. they all walk in a similar manner.

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

Which is an example of a population?

How does a lytic infection differ from a lysogenic infection?