Combustion is the burning of a substance. It could be complete or could be incomplete. It changes the form of carbon and so it plays it's role in cycle
Answer:
Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. ... Blood vessels nourish the cells in the hair bulb, and deliver hormones that modify hair growth and structure at different times of life, if that answers your question.
Explanation:
Your answer should be A. by observing the formation of sedimentary rocks.
Birds because they spread seeds
Answer
Some organisms observed by Charlis Darwin are as follow:
1. Beetles
2. Giant tortoise
3. Mockingbird
4. Rhea
5. Pigeon
6. Sand lady slipper