Punnett square riddle

Although there are a limited number of amino acids many different types of proteins exist because..

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars