Bending over and touching your toes describes flexion in reference to your intervertebral discs.
There are multiple reasons. 1) there are similar fossils found on different continents. 2) the continents shapes show that they could easily fit together. 3) there are similar rocks, minerals,and land forms on different continents. 4) there's evidence that there was once lush vegetation in areas with extreme cold.
The answer to this question would be A:growth factors
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Carolus Linnaeus recognized the vital role of the internal environment and suggested that objective of mechanisms within the body is to preserve the constant conditions of the internal environment.
He was later known as the creator of current modern system of naming animals called binomial nomenclature
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A Polypeptide chain is a sequence of amino acids that is the foundation for the basic structure of a protein