What relationship exists between the densities of predator and prey populations, according to the graph "Population Change of a Predator and its Prey Over Time"? When the prey population peaks, the predator population is decreasing.
As the prey population decreases, the predator population remains constant.
After the prey population increases, then the predator population also begins to increase.
As the prey population increases, the predator population remains constant.

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.