How can humans interfere with the phosphorus cycle?

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

The negative impacts of nonnative species generally outweigh the positive impacts

Which of the follow describes a disadvantage secondary sources have compared to primary sources?