ENV 1101 Study Guide - Midterm Guide: Hydrosphere, Zero Population Growth, Keystone Species

• School: University of Ottawa
• Department: Environmental Studies
• Course: ENV 1101
• Professor: Sonia Wesche

Document Summary

There are 6 key elements used to create organic matter (living things): = goods and services humans derive from the natural environment. When you stop adding energy to a system, entropy increases and eventually the system stops ex: people in africa with no clean drinking water. Population: a group of individuals of a particular species that live in the same area. The capacity for a given species to increase its numbers given optimum conditions, through reproduction, geographical expansion of habitat or both. High = fish , lays 1000 of eggs at a time, low= whale, 1 calf at a time and long gestation period. The total sum of factors that limit the potential for a species to increase its numbers or its geographic range. The lowest number of organisms required to ensure that a population may reproduce and continue. Without human intervention, a species below the critical number will likely become extinct.