D) allele frequencies of some traits change in the population
Alleles can be phenotype (how they appear) and natural selection is when an organism changes in a way that helps them survive.
It can be the way their beaks are formed that gives them a better chance of catching food among other stuff (Darwin's investigation)
Or how they change their color to adapt to the sudden change in tree coloration (Pepper moths)
Because humans are unable to make some vitamins known as essential vitamins, we must gain them from our diet
They are both external and internal can cause a response or resulting reaction
Yes, there are procedural non-steroid based therapies for alopecia areata
