Answer in full sentences. Number your answers.1. What is the current estimate of

Answer in full sentences. Number your answers.1. What is the current estimate of the worldwide human population? Cite your reference.2. Describe with facts and details (150 words minimum) how the human population has affected the marine ecosystem. This must be specific and not general in nature. You must include your reference.3. Describe with facts and details (150 words minimum) how the human population has affected the Amazon River ecosystem. You must include your reference.4. Describe with facts and details (150 words minimum) how the human population has affected the African plains ecosystem. You must include your reference.Cite your references: references must be of academic nature.