Q: What type of behavior is frogs croaking or deer clashing antlers an example of? Choices: - instincts - learned behavior - mating - courtship A:
courtship

Q: The mole fraction of the solvent is just one minus the mole fraction of what? Choices: - nutrients - solution - molecules - solute A:
solute

Q: The lack of annihilation radiation coming to us from space proves that the universe is dominated by what? Choices: - vacuum - energy - space - matter A:
matter