How does natural selection produce adaptations in a species

If a species of creatures homes were destroyed like lets say humming bird for an example, they move into a colder habbitat in whch they are not used to, so some survive and some dont because of natural selection. The ones whom survived later inhearated thicker fur.
If you want more details look at finches variations of beaks accordng to their habbtat on google

Natural selection results in adoption when individual in a population have an higher reproduce and survival rate due to presence of a particular trait

The correct answer is:   [b]:   "physical systems" .

There are allot let me mention a few. 1. catholicism 2. orthodox3. lutherans 4. protestants. they are different because, catholicism has a pope but not the orthodox even though they are almost the sames