Sickel cell anemia is an inherited disease that is due to a base substitution mutation in a gene.
The first one with the boxing crab and anemone is mutualism.
The second one with the dog and flea is parasitism.
I attached the image related to your concerned question.
In theory, the part of the brain that is responsible for the sleep wake cycle is the hypothalamus; specifically, the ventrolateral preoptic nucleus of the hypothalamus. In the image, the location of the hypothalamus is pointed by the green square.
A gymnosperm is <span>a plant that has seeds unprotected by an ovary or fruit. Gymnosperms include the conifers, cycads, and ginkgo.</span>