Q: What simple machine consists of a bar that rotates around a fixed point called the fulcrum? Choices: - battering ram - rotor - catapult - lever A:
lever

Q: What are the only organisms that can perform photosynthesis? Choices: - sponges - monocots - heterotrophs - autotrophs A:
autotrophs

Q: Mammals have four limbs and produce what kind of eggs? Choices: - placental - umbilical - hard-shelled - amniotic A:
amniotic