PLEASE HELP During which stage of prenatal development do body systems and organs begin to function?

Fetal
Germinal
Conception
Embryonic

If you are going to enter a wrestling competition and need to make a certain weight, which method would best utilize? a: pinch an inch b: circumference measurements c: bathroom scale d: body-fat scale

10. what is one long-term effect of tobacco use? changes in brain chemistry coronary heart disease decreased appetite increased heart rate

Explain different ways infections from different organisms can be treated.