If cigarettes causes direct damage to the lungs, then what do cigarettes cause? Answer choices: - circulatory systems - a lot of human deaths - increased health of lungs - increased stamina in life - Something that causes allergies - guaranteed longer life - harmful substances - direct damage to the lungs
direct damage to the lungs

If beavers cause ponds and lakes to form, then what can be the cause of lakes and ponds forming? Answer choices: - beavers - heat - Pesticides - flooding - erosion - rainfall - loose soil - spring
beavers

If fungi are involved in increasing the amount of organic matter in soil, then what can help increase the amount of organic matter in soil? Answer choices: - Fungi - mussels - pine - worms - animals - Enzymes - solutes - trees
Fungi

If garbage can be burned to produce electricity, then burning garbage can be used to produce what? Answer choices: - warmth - heat energy - a slowing of global warming - gold - electricity - adding heat - mutant protection - carbon dioxide
electricity