D. 2. Which of the following is a symptom of sickle cell disease?
a. Swelling in the hands and feet
C. Pain
d. All of the above

This is a coral reef ecosystem. many biotic and abiotic factors affect the health of this ecosystem. which set correctly pairs a biotic factor and an abiotic factor?

The fauces connects which of th following structures to the oropharynx

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