The heart must beat faster during exersise because by increasing the heart rate the body is able to increase cardiac output and deliver the necessary blood flow to the mucles
1.Most aquatic animals have fins or paddles that help them swim
2. Skin is usually slippery and soft
The answers are principles C and D. After the big bang, particles in gas clouds were closer to each other and clumped up faster. As they clumped together, they gained more gravitational force, eventually creating asteroids, stars, and planets.
1. Diffusion
2. Osmosis
3. Facilitated Diffusion
