Question

what is hackles law​

Answer 1

Answer:

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The biogenetic law is a theory of development and evolution proposed by Ernst Haeckel in Germany in the 1860s. ... The biogenetic law states that each embryo's developmental stage represents an adult form of an evolutionary ancestor.

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Answer 2

Answer:

In 1931, German chemist and physicist Erich Hückel proposed a theory to help determine if a planar ring molecule would have aromatic properties. His rule states that if a cyclic, planar molecule has 4n+2 π electrons, it is considered aromatic. This rule would come to be known as Hückel's Rule.

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