If veins carry blood that is heavy with carbon dioxide, then what is blood heavy with? Answer choices: - Carbon monoxide - Energy. - Bacteria - Chemical energy - matter vibrating - Carbon dioxide - Veins and arteries. - Water
Carbon dioxide

If frogs can breathe with gills as larvae and with lungs as adults, then what can breathe with gills as larvae and with lungs as adults? Answer choices: - humans - viruses - a fish - animals - bats - frogs - bacteria - air
frogs

Q: If solid materials used to produce electricity by burning in power stations need to be transported first, then solid materials used to produce electricity by burning in what need to be transported firs? Answer choices: - Conifers - animals - it needs them - humans - heat energy - important habitats - power stations - batteries
A: power stations

Question: If cell division is how plants grow and repair themselves, then what uses cell division to grow and repair itself? Answer choices: - amoeba - fungi - density - animals - h2o - plants - clouds - grass
Answer: plants

*Question*
If cocaine causes the muscular walls of blood vessels to contract, then cocaine causes what to contract? Answer choices: - layers of fat - a lot of human deaths - Walls of blood vessels. - harmful substances - the rest of the body - metabolic reaction - direct damage to the lungs - decreases its bodily water
**Answer**
Walls of blood vessels.

Q: If threatening behavior can cause injury, then what can threatening behavior cause? Answer choices: - love - toxins - Pollution - disease - knowledge - injury - negative - friendship
A: injury