What term is defined as mathematical equations based on rules of physics?

What heat is removed how does a gas become a liquid

Could someone me with number one you

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.