B. The similarities that they both share are their forlimbs they maybe different due each having ddifferent lifestyles but they all share the same set of bones the Humerous, the radius, and the ulna.. they both can adapt to water land or a desert land. both having tadpole babies that look very similar to one another in very first days of life. Both are amphibian and have a vertebrate. They both rely on long, snake-like tongues to catch their prey. Though they may both be classified as amphibians and share similar traits. The Lizard comes from more of reptile family and frog don't have scales like they do but are very similar down the road.
C. eusthenopteron is the common ancestor they share because of the same bone structure they all have containing the humerous , ulna and the radius. Eusthenopteron, genus of extinct lobe-finned fishes (crossopterygians) preserved as fossils in rocks of the late Devonian Period (about 370 million years ago).Eusthenopteron was near the main line of evolution leading to the first terrestrial vertebrates, the tetrapods. It was 1.5 to 1.8 metres (5 to 6 feet) long and was an active carnivore, with numerous small teeth in its broad skull.
http://www.britannica.com/EBchecked/topic/196682/Eusthenopteron
D.

2. two different species who possess the analogous trait the legs of the frog and the grass hopper.
C. They do not have a common ancestor these two are completly different showing no origin of similar or sharing an ancestor.
D.


