Q: What is an upward force that fluids exert on any object that is placed in them? Choices: - gravity force - warm force - efficient force - buoyant force A:
buoyant force

Q: When flagellated sperm must swim to the egg, sexual reproduction requires the presence of what substance? Choices: - air - nitrogen - sunshine - water A:
water

Q: What is the name for a substance that can be used to follow the pathway of that substance through some structure? Choices: - gel - tracker - solution - tracer A:
tracer