Answer
D.Osteoblasts
Explanation:
Appositional growth is the increase in the diameter of bones by the addition of bony tissue at the surface of bones. Osteoblasts at the bone surface secrete bone matrix, and osteoclasts on the inner surface break down bone. The osteoblasts differentiate into osteocytes.
They live in the anoxic muds of marshes and at the bottom of the ocean, and even thrive in petroleum deposits deep underground.
Blood flows to the brain through the internal carotid and vertebral arteries and away from the brain through the internal jugular vein. The internal carotid artery supplies the brain, while the external carotid nourishes other portions of the head, such as the face, skull, scalp and the meninges. The vertebral arteries provide supply to the upper spinal cord, brainstem, cerebellum, and the posterior part of the brain.
Saturated zone
The correct answer is saturated zone. This area contains permeable rocks and soil here is totally filled with water or we can say is saturated with the water. This zone is called as saturated zone.
