Ques: If living things cannot survive without oxygen, then what cannot survive without oxygen? Answer choices: - animals - tanks - an organism's body - living things - hydrogen - space - Veins and arteries. - mammals
Ans: living things

Ques: If hearing is used for sensing vibrations by animals, then hearing is used for sensing _ by animals? Answer choices: - A Greek letter - waves - vibrations - motion - messengers - humans - four limbs - some mammals
Ans: vibrations

Ques: If loose soil has increased air exchange, which is essential for plants, then what can enhance a plant's growth? Answer choices: - sunlight - tight soil - Energy. - loose soil - Enzymes - compacted roots - energy - compact soil
Ans: loose soil

Ques: If stopping air pollution has a positive effect on an ecosystem, then what has a positive effect on an ecosystem? Answer choices: - maintaining air pollution - removing habitats - stopping air pollution - to stay warm - in the frog family - Electric generators - increasing air pollution - genetic diversity
Ans:
stopping air pollution