When observing a group of children at a daycare center, emily made the following observations: five year old children played in one location during independent play time. three year old children moved between different activities, rather than staying in one location. by analyzing emily’s observations, what could be a valid conclusion?

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.

answer(b) keep oxygenated and deoxygenated blood separate;