Voltage sources are used to sustain?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?