If oxygen acts as an aid to a car engine converting gasoline into motion and heat, then what acts as an aid to a car engine converting gasoline into motion and heat? Answer choices: - Energy. - oxygen - nitrogen - helium - argon - energy - burning - sugar
oxygen

If plucking a string can cause that string to make a noise, then plucking a string can cause that string to make what? Answer choices: - colors - light - Energy. - a chime - flavors - sound - noise - waves
noise

Q: If fish, amphibians, reptiles, birds, and mammals have a backbone, then fish, amphibians, reptiles, birds, and mammals have what? Answer choices: - food - fur and fat - backbone - power - four limbs - retina - vision - competition
A: backbone

Question: If organic matter is increased by decomposing, then what does decomposing increase? Answer choices: - fossils - Motility - prolactin release - oil - organic matter - aerobic capacity - Energy. - water
Answer: organic matter

*Question*
If echinoids have tube feet, then what kind of feet do echinoids have? Answer choices: - tube - long - warm - webbed - arched - edible - muscle - flat
**Answer**
tube

(Q).
If carbon monoxide is a gas produced by furnaces and other engines, then carbon monoxide, a product of furnaces and engines, is a:? Answer choices: - acid - CO2 - kill - harm - gas - form - CO 2 - HPV
(A).
gas