What was the average CO2 concentration at the start of the study?

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

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?