The smoke from the industrial revolution's factories made it so the trees turned black. The white colored moths couldn't survive anymore because they didn't blend into the trees. One day a genetic mutation happened, and the moth turned dark. The dark moth was able to survive better, and therefore, mated, and produced more dark colored ones.
Receptors which provide animals with information from the external environment are located in ears, tongue, eyes, and the nose. These are all receptors that can be found in our sensory organs and provide us with feedback from our nearby environment and the stimuli on which we should be alerted towards.
Answer:
a system
Explanation:
it's like how stomach , small intestine , large intestine together form digestive system and how trachea , lungs , alveoli for respiratory system and so on
Double and single strands
