Q: Electromagnets can be turned on or off and their strength can be changed by controlling what? Choices: - steady current - powered current - inducing current - electric current A:
electric current

Q: What is used to measure air pressure? Choices: - metrometer - indicator - thermometer - barometer A:
barometer

Q: In what type of reproduction do parents of different sexes mate to produce offspring? Choices: - subject reproduction - parallel reproduction - dual reproduction - sexual reproduction A:
sexual reproduction