If smoke is a product of oxygen being burned, then smoke is a product of what being burned? Answer choices: - an object - oxygen - engines - trees - Oak - energy - Cooking - Cars
oxygen

(Question)
If diffusion requires energy, then what requires energy? Answer choices: - diffusion - empty space - Plants growth - nothing - salamanders - animals - passive transport - Cooking
(Answer)
diffusion

Ques: If fat is used to keep humans warm, then what uses fat to keep warm? Answer choices: - Lobsters - bacon - humans - pigeons - insects - omnivores - plants - bears
Ans: humans

(Q).
If being outside is a good way to get vitamin D, then what is a health benefit you receive for being outside? Answer choices: - Relieve pain - staying warm - exercise - inactive - vitamin D - air cools - layers of fat - sweating
(A).
vitamin D

Ques:If infection can cause an aneurysm, then what can cause an aneurysm? Answer choices: - smoking - infection - bacteria - viruses - Pollution - steroids - influenza - rays or beams

Ans:infection

If toads have a relatively complex circulatory system with a three chambered heart, then what has a three chambered heart? Answer choices: - alpacas - goats - elms - bats - orchids - mammals - a fish - toads
toads