It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
Answer:
Earth's atmosphere has a series of layers, each with its own specific traits. Moving upward from ground level, these layers are called the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The exosphere gradually fades away into the realm of interplanetary space.
Explanation:
Layers of Earth's Atmosphere | Center for Science Educationhttps://scied.ucar.edu
Answer:
Limit their fast food intake.
Explanation:
Fast food places have a lot of salt in their food because adding salt, which is a preservative, allows them to store the food supplies longer and save money.
Answer:
They are both celestial bodies orbiting our Sun, and they both can have unusual orbits, sometimes straying close to Earth or the other planets
