For the following free body diagrams identify if the forces are balanced or unbalanced. Then determine the net force if it is not zero and the direction of motion.

Which organisms have pharyngeal arches that develop from all three germ layers and go through the same development stages as embryos? 1.bird 2.ladybug 3.starfish 4.snake

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

The response is the basis for vaccination. primary secondary tertiary none of the above