How did the first people to arrive in the americas support themselves?
1) by fishing
2) by gathering
3) by hunting big animals
4) by hunting small animals

What adaptations can prey use to avoid predation

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 of the following is a testable hypotheses?