Q: Hay fever is actually an allergy to what substance, vital to plant reproduction? Choices: - nitrogen - fungi - grass - pollen A:
pollen

Q: What is the energy needed to start a reaction between catalysts and reactants called? Choices: - reaction energy - decomposition energy - conductivity energy - activation energy A:
activation energy

Q: What organs secrete hormones that help maintain homeostasis? Choices: - the digestion organs - the lungs - the gonads - the kidneys A:
the kidneys