*Question*
Condensing means changing from a gas into a liquid by reducing heat energy, and boiling is the change of state from liquid to gas, with condensation the reverse change. Given these facts, condensing means the opposite change of state to what among the following options: - Dilution - water - heat - sweating - less water - boiling - melting - freezing
**Answer**
boiling

*Question*
Migration is a type of movement that changes population size, and insects can also migrate. Given these facts, what can change population size through movement among the following options: - cows - ducks - goats - animals - relocation - mammals - fur seals - insects
**Answer**
insects

*Question*
Acid rain has a negative impact on water quality, and sulfur dioxide causes acid rain. Given these facts, water quality can be negatively effected by what? among the following options: - flooding - Pesticides - erosion - contamination - competition - Pollution - sulfur dioxide - deforestation
**Answer**
sulfur dioxide

*Question*
Vinegar can cause harm to the eyes, and vinegar is dilute acetic acid. Given these facts, what can acetic acid do to the eyes among the following options: - treat cataracts - harm them - Relieve pain - Dehydration - kill them - hydrate them - protect them - cleanse them
**Answer**
harm them