Birds, Salamanders and Sharks are all Endotherms and can manipulate their body temperatures.
The condition of the atmosphere at a particular time and place is 'weather'. The answer to the question posted above is 'weather'. Weather is the state of the atmosphere at a given time and place with variables such as wind, temperature and more that affect it.
What is Mutation
The major source of the genetic diversity among microorganisms upon which natural selection operates is Mutation.
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I believe the answer is Sunlight.
In our world, the bimass of plants (which considered as living things) make up 1000 more population compared to another living organism.
The plants get their food mainly from the photosynthesis process that utilize Sunlight, water, and other nutrients from soil.