Question 30 (2 points) The structure and maintenance of all ecosystems results from the types of animals in that ecosystem. types of plants in that ecosystem organisms in that ecosystem. Question 31 (2 points) Discuss the current status of water availability from a global standpoint in terms of availability, sustainability, and future supply in our continual growing population - 40- 70 words. Question 32 (2 points) Gutters and storm sewers in a city are most concerned with the groundwater loop evapotranspiration loop precipitation loop surface runoff loop

**Question 30** The structure and maintenance of ecosystems depend on the interactions among all living components. Therefore, the answer is: \( \textbf{organisms in that ecosystem} \). --- **Question 31** Globally, water is unevenly available. Although the total water volume is high, only a small fraction is accessible and clean. Population growth, pollution, and uneven distribution challenge sustainability. Future supply depends on improved water management, conservation practices, and innovative infrastructure to meet growing demands while protecting quality and ecosystems. --- **Question 32** Gutters and storm sewers manage the flow of water that runs over land surfaces. Thus, they are most concerned with the: \( \textbf{surface runoff loop} \).