NEET BIOLOGY

Detailed explanation-1: -Embryos of different species have differences and similarities in structures up to a certain period during gestation. Human, pig, reptile, and bird embryos have similar embryonic development but as they grow, they transform into their respective species. This demonstrates common ancestry.

Detailed explanation-2: -Embryos of organisms that have a closer genetic relationship to one another tend to look similar for a longer period of time since they share a more recent common ancestor. In early embryonic stages, embryos will often form structures that will not be present in the organism’s final form.

Detailed explanation-3: -Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species’ relatedness.

Detailed explanation-4: -Today, scientists can compare their DNA. Similar DNA sequences are the strongest evidence for evolution from a common ancestor.

Detailed explanation-5: -Answer and Explanation: Comparative embryology shows the similarities in embryonic development between species indicating we all came from one common ancestor that evolved into different species over millions of years.