You are presented with the quiz "What can be used for keeping aerosols from entering the respiratory system?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "abreathing mask is used for keeping harmful particles from entering the respiratory system" and "aerosols are tiny particles suspended in the air". So, what's the best answer to the question?
OPTIONS:
- goggles
- hydration
- sweating
- hydrogen and oxygen
- breathing masks
- lab coats
- layers of fat
- gloves

Answer: breathing masks

You are presented with the quiz "Prehistoric life is preserved in rock when what covers the remains over time?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fossils are formed when layers of sediment cover the remains of organisms over time" and "fossils are evidence of prehistoric life that is preserved in rock". So, what's the best answer to the question?
OPTIONS:
- Plant growth is reduced
- an amoebae
- layers of sediment
- single-celled organisms
- loose soil
- layers of fungus
- layers of bone
- layers of mucus

Answer: layers of sediment

You are presented with the quiz "What may soak into the ground, becoming groundwater?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "some precipitation that falls on land may soak into the ground, becoming groundwater" and "rain is only one kind of precipitation". So, what's the best answer to the question?
OPTIONS:
- h2o
- wells
- H 2 O
- rain
- H20
- blood
- dust
- river

Answer:
rain