Answer:
I think its A
Explanation:
Because the reason why airplane have closed windows is because we can't breathe in carbon dioxide when we go up. Of course there is oxygen just not a lot as we go up. Why would there be helium in the air? We would sound weird when we skydive.
The nucleus and Its structures
A tree's mass is mainly biomass. During photosynthesis plants, the carbon is used to transform the Sun's energy into chemical energy that is captured in the bonds of carbon molecules made of atmospheric carbon dioxide and water
Examples of sentences using the word Consumer:
> The consumers must be made aware of all the ingredients used in making this product.
> Advertisement serves to create awareness for the consumers of the variety of products in the market.
> As a consumer of your product, I am in a position to criticise it and make suggestions.
