Unlike amphibians, reptiles
a. have lungs to oxygenate blood. b. use single-loop circulatory system. c. have a closed circulation system in which blood circulates entirely within blood vessels. d. have ventricles that are further divided to lessen mixing of oxygen-rich and oxygen-poor blood.

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

This is the main structural axis of the plant that supports leaves, flowers and fruits; transports fluids; stores nutrients and produces new tissue.

Which hormone is used by both males and female?