Why are fossil fuels a relatively short-term source of energy

Fossil fuels are non-renewable energy resource

Explanation:

Non-renewable resources are those that are not regenerated in nature at rates equivalent to their use. They include oil, coal and other minerals. Our lives and those of future generations are completely dependent on these resources.

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.