When would a person only have 1 alleal per trait ?

Why do german shepherds shed so much

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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