Answer:
I believe the answer is Dissolved Oxygen.
Explanation:
Dissolved oxygen (DO) is the amount of oxygen that is present in water.
Answer:
The correct answer would be D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.
Alveoli are tiny sacs which form the site of gas exchange in the lungs.
The features of alveoli which help in gas exchange are:
- They increase the surface area in the lungs thus, more space is available for gas exchange.
- They have very thin walls, as thin as the thickness of a single cell only.
- They are surrounded by a bunch of thin capillaries which exchange gases with alveoli.
metals (left side of periodic table) become positive ions so calcium would be the answer
It makes up the Nervous System, if you're asking what it is made up of, Brain: Cerebellum, Cortex, Brain Stem, and Basal Ganglia; The spinal cord is made up of: Vertebrae and cartilage; the parts of the spine are: Cervical, Thoracic, Lumbar, Sacrum, and Coccyx <span />