"(1) Human population growth reached 6.8 billion in 2010 and it continues to increase" is what led to the other <span>three, since all of these happen from human activity. </span>
<h2>overexploitation..</h2>
Overexploitation, also called overharvesting, refers to harvesting a renewable resource to the point of diminishing returns. Continued overexploitation can lead to the destruction of the resource. The term applies to natural resources such as: wild medicinal plants, grazing pastures, game animals, fish stocks, forests, and water aquifers.
Green plants use their chlorophyll to capture the energy of sunlight and split water molecules. As they do, they release oxygen into the air. Green plants use energy from the sunlight and carbon dioxide from the air to make sugar. In effect, they create “mass” from “gas.”
For simple diffusion is when the exchangeous of oxygen from alveolus and blood capillary while for facilitated diffusion is muscle