Which description is an example of converting gravitational energy into kinetic energy?

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Resperation is a way to release carbon back into the atmosphere

Which organ controls breathing? lungs alveoli heart diaphragm