Which of the following evolved into the first amphibians?

According to the theory of pangenesis proposed by Charles Darwin,the pangenes of an animal are accumulated in:

$A$ scientist kept $72$ generations of $Drosophila$ in darkness. Even after that,the first flies had normal eyes. This disapproves the theory of

In which of the following cases is Darwin's theory considered incorrect or incomplete?

What are we referring to when we say 'simple organisms' or 'complex organisms'?

The theory of inheritance of acquired characters was proposed by ........