The atmosphere has 4 layers: the troposphere that we live in near the surface of the earth; the stratosphere that houses the ozone layer; the mesosphere, a colder and lower density layer with about 0.1% of the atmosphere; and the thermosphere, the top layer, where the air is hot but very thin.
The way how our bodies adapt surface area-to-volume ratios to help exchange gases is that our lungs has alveoli which consist of very small spheres whose main function is to allow us to <span>exchange gas. I hope it is clear. Regards!</span>
loss of sensation to pressure and touch
Answer is 1
Answer:
By looking at human embryo we can determine that it has a postanal tail.
Explanation:
Human embryo is a a process of life cycle that takes place after the fertilization. It takes 9 months for a human embryo to be fully developed. If we take a look at a human embryo, we will notice that it has a postanal tail.
Postanal tail is simply an extension of body. It is only during the embryonic stage that the postanal tail can be found. After the birth this feature cannot be found.
They are held together by weak hydrogen bonds
