You are presented with the quiz "What happens to ice in water?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if an object in a fluid is more dense than that fluid then that object will sink in that fluid because of gravity" and "normally ice floats, because it is less dense than water". So, what's the best answer to the question?

OPTIONS:
- it evaporates
- it sinks
- it floats.
- it expands
- they bend
- Condensation
- vaporization
- kinetic energy

Answer: it floats.

You are presented with the quiz "What swims to female reproductive organs for fertilization?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sperm had to swim from male to female reproductive organs for fertilization" and "sperm and eggs are cells known as gametes". So, what's the best answer to the question?

OPTIONS:
- barnacles
- alpacas
- fur seals
- male gametes
- A Greek letter
- eggs
- birds
- tadpoles

Answer: male gametes

You are presented with the quiz "What does the pituitary do to other endocrine glands??" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "most pituitary hormones control other endocrine glands" and "growth hormone is made by the pituitary". So, what's the best answer to the question?

OPTIONS:
- adding heat
- it releases them
- it needs them
- Damages them
- interact
- it destroys them
- it sends them to the skin
- it controls them

Answer: it controls them

You are presented with the quiz "what can be used to kill existing microorganisms in food?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "irradiating food can be used to kill existing microorganisms in the food" and "irradiation causes chemical changes". So, what's the best answer to the question?

OPTIONS:
- chemical changes
- Dehydration
- deoxyribonucleic acid
- bacteria
- an electron microscope
- hydration
- electromagnetic energy
- single-celled organisms

Answer:
chemical changes