As part of a long-term elephant study, biologists counted individuals in a population of elephants each spring. In one year, the
re were 18 males and 34 females. Over the following year, each female gave birth, from which 28 offspring survived. Predators killed 9 elephants. A construction project cleared 50 acres of nearby forested land, causing 5 males and 19 females to immigrate into the study area. Competition for females increased, resulting in the emigration of 10 males to a new territory in search of mates
If a plant uses up all of the carbon dioxide this would just keep makeing oxygen or its known as photosynthesis. I'm NOT a 100% sure If this is is the correct answer or not.
The key factor in determining the habitable zone of a planet is looking for a Earth-like planet that is able to have water on it's surface, and make sure that it can still give or support life.