Q: What are the two best known baryons? Choices: - flux and neurons - electrons and neutrons - shafts and neutrons - protons and neutrons A:
protons and neutrons

Q: What do scientists believe are the oldest eukaryotes? Choices: - prokaryotes - worms - arthropods - protists A:
protists

Q: The first few species to colonize a disturbed area are called what? Choices: - producer species - original species - colonization species - pioneer species A:
pioneer species