PLEASE HELP 1-3!!!!

The Earth's troposphere is known for being he layer of the atmosphere ______

Select one:

Athat is the highest in elevation above the Earth's surface

Bwhere meteors burn up on their descent

Cthat is closest to the Earth's surface and contains the weather

Dthat contains the ozone layer

As a result of the experiments of Lavoisier, you know that in a chemical reaction the mass of the products __________.

Select one:

Acannot be predicted based on the mass of the reactants

Bs less than the mass of the reactants

Cis twice as great as the mass of the reactants

Dalways equals the mass of the reactants

This is the site of cellular respiration in all eukaryotes.

Select one:

Alysosomes

Bribosomes

Cchloroplasts

Dmitochondria