Answer:
Step-by-step explanation:
The conclusion of the scientist is valid.
Homologous structure are structures that are similar in appearance but differs in their functions. Such organs are usually inherited from a common ancestor.
The forelimbs of bat and that of bird as shown in the image are homologous to each other. They are both similarly built but performs different functions. This means that they both inherited the forelimbs from a common ancestor.
Hence, the conclusion of the scientist is valid.