by biting into the skin were the blood flows, (it knows were the veign is as it is warmer than skin with no veign
No, its just some reptiles that obtain oxygen through their skin. Many of them breath through their lungs.
No, they breathe through their lungs.
Mammals lose heat because they are often warmer than their surroundings, it is a law of thermodynamics that heat flows from warm to cool.
Unlike mammals who absorb oxygen through the alveolar in their lungs, frogs are able to use their skin as a surface for gas exchange. The capillaries carry oxygen poor blood underneath the skin so that the oxygen in the air or water will be transported into the blood.
Blood is supplied to the skin through capillarity vessels
Blood is supplied to the skin through capillarity vessels
All mammals have skin.
The air around the earthworm goes through the skin.
Lungs and moist skin.
No, all mammals have a respiratory system just like that of a human's. I don't deny that breathing through your skin would be really cool!
The frog's skin has many small blood vessels so that oxygen can go through the thin skin, through the fine blood vessels, and into the blood stream, allowing for the frog to breathe more easily.
The physical changes from reptiles to mammals are there skin. Reptiles have dry scaly skin and mammals have smooth skin.