Which of the following structures is homologus to the wing of a bird ?

Following are the two statements regarding the origin of life -
(a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes
(b) The first autotrophic organisms were the chemoautotrophs that never released oxygen
Of the above statements which one of the following options is correct ?

Dinosaurs dominated the World in which of the following geological era ?

Random undirectional change in allele frequencies that occur by chance in all populations and especially in small populations is known as :-