You are given a sentence and your task is to generate another sentence that supports the given input.

Many genes have multiple (more than two) alleles.
The majority of human genes have two or more possible alleles.

Within the past 200 years or so, increased amounts of carbon dioxide and other greenhouse gases have been released into the atmosphere due to human activity.
The composition of the atmosphere has changed over the last 200 years primarily due to human activity.

All the elemental oxygen now in the earth's atmosphere was put there by photosynthetic plants and bacteria.
On a global scale, plants and other photosynthetic organisms have generated all of the oxygen in the air.