Q: If releasing carbon into the atmosphere has a negative impact on an ecosystem, then releasing what can have a negative impact on an ecosystem? Answer choices: - disease - viruses - A virus - Carbon - tar - toxins - herbicide - vehicles
A: Carbon

Q: If the largest group of animals are insects, then what are the largest group of animals? Answer choices: - sharks - insects - tortoises - crocodiles - people - fur seals - animals - protected
A: insects

Q: If walking is a moderate way to have a positive impact on a human 's health, then what is a moderate way to have a positive impact on a human 's health? Answer choices: - Cooking - walking - high fat - Heart rate - skipping meals - pollution - sweating - food
A: walking

Q: If echolocation is used to find objects underwater, then what is used to find objects underwater? Answer choices: - echolocation - a hydraulic system - heat energy - Electrical energy - dolphins - mussels - by indirect light - rays or beams
A: echolocation