Kepler's third law is founded on a mathematical formula that is based on the inverse relationship between a planet's orbital velocity and its distance from the sun the earth the moon some other entity

Explain to someone who knows nothing about fossils the study of invertebrate paleontology and how it scientists understand the history of the earth. be sure your explanation contains a minimum of two complete sentences.

Hydrogen and helium are both members of?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?