Percentage of human sperm cells carry an X chromosome is C 50%
1- Evaporation: Energy from the Sun causes water to become vapor and rise into the atmosphere.
2- Condensation: The water is cooled in the temperatures of the lower atmosphere, turning it from vapor into liquid water and collect into clouds.
3- Precipitation: The clouds become too heavy to remain in the sky, and it rains.
Basically, there is a presentation of types of food and the amount of those foods over 50 years in this graph. This means the graph is showing amounts of certain foods over the time period. I'm guessing that basing off of the the previous text you're just noting a change in the breaks of birds based off of the diet available to them at certain times. The adaptations and natural selection will explain the changes because due to certain limited and available foods the diet of the birds change.
