Question

In birds, forelimbs have

• A. One digit
• B. Two digits
• C. Three digits
• D. Four digits

Answer 1

The correct option is C Three digits

The forelimbs and hind limbs of vertebrates are homologous structures (The homologous structures are those wit same structure but performing different functions). However, bird limbs differ from many other vertebrates. They have only three digits in the forelimb (wing) and four digits in the hindlimb (leg). This pattern has emerged through a process of digit loss during evolution. Hence, option C is correct.