1. C
2. A.
3. C.
4. D.
Disclaimer: My answers could be wrong, but they are here to help you think about the questions. Good luck!
Answer:
Equilibrium is defined as a state of balance or a stable situation where opposing forces cancel each other out and where no changes are occurring.
Tbh I got no idea of the answer
"Et al" would be the Latin phrase that is used with the primary author's name when a book has more than three authors, the reason why this Latin phrase is used is because this means "and others" that refers to the other authors that wrote the book.
