Any change in allele frequencies in a gene pool is a mutation
I think a period of hot summers will affect the rabbit population in a positive way. This is because it will allow the population to increase in size, and get ready for the harsh weather to come throughout the rest of the year.
Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
