Which of these is the smallest?
asteroids
comets
planets
meteoroids

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

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above