Explain the embryological evidence for evolution.

(N/A) The embryological evidence for evolution was proposed by $Ernst \text{ } Haeckel$ based on the observation that certain features during the embryonic stage are common to all vertebrates but are absent in adults.
For example, all vertebrate embryos, including humans, develop a row of vestigial gill slits just behind the head.
However, these are functional only in fish and not in other adult vertebrates.
This proposal was later disapproved by the careful study conducted by $Karl \text{ } Ernst \text{ } Von \text{ } Baer$.
He noted that embryos never pass through the adult stages of other animals.