If cutting down oaks has a negative impact on an ecosystem, then what has a negative impact on an ecosystem? Answer choices: - planting trees - cutting down oaks - Destroy bridges - planting oaks - adding habitat - deforestation - massive damage - Pesticides
cutting down oaks

If viruses contain deoxyribonucleic acid but not much else, then what contains deoxyribonucleic acid but not much else.? Answer choices: - minerals - bacteria - loose soil - pollen - viruses - anemia - PDAs - vertebrates
viruses

If using a bike saves energy, then riding a bike reduces what? Answer choices: - energy usage - Greenhouse gasses - acid rain - harmful substances - Greenhouse gases - temperature - prolactin release - storms
energy usage

If sea tigers live in salt water, then what type of water do sea tigers live in? Answer choices: - warm-blooded - survival - Frozen - liquid - Salt water - Fresh - Absorb light - Evaporated
Salt water