Which statements describe Newton and the law of universal gravitation? Check all that apply.

1 .Newton believed that gravity was a force.
2. The law of universal gravitation states that gravity is the force that keeps birds in flight.
3. The law of universal gravitation offers a mathematical explanation for the attraction between the moon and Earth.
4. Newton was the first to have the idea that gravity is everywhere.
Gravity is measured in masses.

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

amber has allowed scientists to study dna that has been preserved over millions of years.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.