Fats yield more than twice as many calories per gram than do proteins or carbohydrates.

Fat has more than twice as many calories per gram as carbohydrates and proteins. A gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories. In other words, you could eat twice as much carbohydrates or proteins as fat for the same amount of calories.

Explanation:

X is back

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.