La fisica, the rest are school subjects.
Reflexive verbs take different pronouns depending on who is doing the action. In this instance you know “ponerse” is reflexive as it ends in “se”.
Yo me pongo la ropa.
Solid, liquid, gas ^^
For example, if you have an ice cube you have a solid piece of matter, but if you heat it up it melts and then it's liquid, and after getting hot enough it evaporates and even though you can't see it it's still there, but as a gas.
By the way, what's this have to do with Spanish?
Answer:
okay so look, spanish isn't really that important but it would help you to learn it a bit. Math it's important you need to get that to At least a D to pass the grade