Which of the following are homologus organs
Wings of Birds and Locust
Wings of Bat and Butterfly
Leg of Cockroach and Frong
Wings of Birds and pectoral fins of Fish
Two zoogeographical regions separated by high mountain ranges are
Presence of $NaCl$ in body fluid indicates that life originated in
Recapitulation theory $(Biogenetic law)$ explains "Ontogeny repeats Phylogeny''. It was given by
Large size of pinnae in animals of warm region in comparison to animal of cold region is due to