Which of these planets would be most able to support a colony of humans?

Planet A: 76% Nitrogen, 23% Oxygen, 1% Other

Explanation:

To support humans, the planet outside the solar system must have a similar composition of atmosphere with the Earth. It must have nitrogen and oxygen as the most abundant gases in the atmosphere, and small amounts of other gases.

what are the options?

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.