Planting trees has a positive impact on an ecosystem, and an ecosystem contains many habitats. Given these facts, doing what with trees has a positive impact on habitats among the following options: - making tables - chopping down - planting - watershed - earth - bloom time - growth - timbering
planting

Nitrogen is found in proteins, nucleic acids, and chlorophyll, and lawns eat nitrogen. Given these facts, what do lawns eat among the following options: - hydrate their cells - density - weathering - organic matter - By wind and rain - Something made from fermented ricce - proteins and nucleic acids - plastic
proteins and nucleic acids

Q: Conserving water can be used for survival in a dry environment, and cactuses exemplify water conservation. Given these facts, what exemplify surviving in a dry environment among the following options: - babies - insects - ferns - traits - bamboo - cacti - bushes - bears
A: cacti

Question: If the amount of available food and water decreases in an environment then animals may leave that environment to find food and water, and all humans are animals. Given these facts, what might leave an environment to find food and water if those things decrease among the following options: - bears - humans - pigeons - Lobsters - grass - clouds - h2o - omnivores
Answer: humans

*Question*
Erosion causes a river to become deeper and wider, and erosion is the movement of soil by water. Given these facts, what happens when water moves soil in a river among the following options: - Exfoliation - Damages them - forest is destroyed - It used to be covered by water - Plant growth is reduced - Physical weathering - The river gets deeper - running and lifting
**Answer**
The river gets deeper

Freezing means changing from a liquid into a solid by reducing heat energy, and liquids freeze when they change to the solid state. Given these facts, what state is a liquid in when frozen among the following options: - vapor - dense - gas - cooled - steam - solid - boiling - cold
solid