What other steps could you have taken to measure effects of exercise on the body?

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

If there is another new infectious disease somewhere in the world, what do you think canadian officials should do