A fish is swimming in fast-flowing, cold, and very oxygenated water. Which ecosystem is this fish most likely in?

The river because a river has fast flowing currents, and rivers are surrounded with plants, that create oxygen, and most rivers are just melted snow water from the mountains!

Explanation:

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.