Question

The scientist who proposed that "embryos of all vertebrates including humans develop a row of vestigial gill slits behind the head but it is a functional organ only in fish and replaced by lungs in all other vertebrates" is ______.

Options

• Darwin

• Lamarck

• Ernst Haeckel

• Mendel

Answer 1

The scientist who proposed that "embryos of all vertebrates including humans develop a row of vestigial gill slits behind the head but it is a functional organ only in fish and replaced by lungs in all other vertebrates" is Ernst Haeckel.

Explanation:

Ernst Haeckel created the ontogeny-phylogeny theory, which states that embryos of all vertebrates, including humans, develop vestigial gill slits during early development. These gill slits only function in fish; in other vertebrates, they are replaced by lungs or other organs.