The statement is false. It was not Karl Marx who coined the phrase "survival of the fittest" It was coined by Herbert Spencer after he read Charles Darwin's evolutionary theory in the book On the Origin of Species. Herbert applied the evolution theory in sociology and ethics.
A domestic enemy of the Constitution is someone who is from the United States that would want to overthrow the government. A foreign enemy of the Constitution is someone from outside the United States wanting to do the same.
Moving water can change land, it can form a canyon, it can erode the sides or bottom of a river. Moving water causes soil and rock erosion.
The answer is glucose and oxygen.