If decomposition increases amount of carbon in soil, then what increases the amount of carbon in soil? Answer choices: - oxygen - decomposition - nutrients - chlorofluorocarbons - rainfall - fossil fuels - wind - water
decomposition

If microbial cells can transform hydrogen into electrical energy, then what do microbial fuel cells transform hydrogen into? Answer choices: - Renewable energy - Electrical energy - kinetic energy - electromagnetic energy - an engine - transportation technology - Solar energy - Oil
Electrical energy

Q: If an object in the sunlight will absorb energy and re-radiate it as heat, then an object in the what will absorb energy and then re-radiate it as heat? Answer choices: - Evaporation - sweating - our star - cigarettes - coal - fossil fuels - sunlight - photons
A: sunlight

Question: If hIV is so small it can only be seen with an electron microscope, then what is so small it can only be seen with an electron microscope? Answer choices: - clouds - cell - DNA - ovum - HIV - magnified - h2o - RNA
Answer: HIV

*Question*
If eyes are used for seeing animals by sensing electromagnetic waves, then eyes are used by animals for seeing by sensing what? Answer choices: - focusing a lens - an electron microscope - objects that have mass - chemical messengers - basic building blocks of life - electromagnetic waves - matter vibrating - rain or sun shine
**Answer**
electromagnetic waves

*Question*
If playing is one way dolphins learn how to behave, then what uses play to learn how to behave? Answer choices: - athletes - offspring - humans - dolphins - density - theater - ants - people
**Answer**
dolphins