1. Explain how Newton’s third law underlies many forms of animal locomotion—from fish, to birds, to humans. 2. A squid propels itself forward by pushing water backward. Why does this occur? 3. When...

1. Explain how Newton’s third law underlies many forms of animal locomotion—from fish, to birds, to humans.

2. A squid propels itself forward by pushing water backward. Why does this occur?

3. When you walk, what is the force that pushes you forward?