Answer:
Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls - allow gases to pass through. Extensive blood supply - ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.
Dogs, no matter what breed they are, they are all of the same species and therefore can breed with each other and create fertile offspring
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They are distinguished by proteins on the erythrocytes.
D-cartilage
Cartilages are soft connective tissues which provide flexibility to certain organs. You can feel it by touching you ear pinna that it is hard and flexible but not fleshy.
Hope I answered the question .
The cramps can be caused due to anaerobic respiration in the muscles and lactic acid formation.
During intense physical activity the muscles become deprived of oxygen, in this condition, anaerobic respiration takes place in the muscle cells causes the formation of the lactic acid.
The physical training increases the strength of the muscles, which can help the muscles not to get tired easily. that is why, physical training is required before any marathon.
