Endocrine system consist of endocrine glands that produces hormones. This hormones are carried by blood to their sites of function
Variation: When one of that species develops another trait or skill that the others do not have.
Adaptation: When a species changes in order to survive a certain place or survive a predator
Answer:
to an evolutionary biologist fitness simply means reproductive success and reflects how well an organism is adapted to its environment.We call them fit because of how successfull they reproduce not how well they do at athletic events
Explanation:
Has something to do with science
