1. (A) The human bone and the bones of a front limb are two homologous trait.
(B) Both limbs end with five digits. eventhough they are very different sizes both limbs have the same structure.
(C) These two species do share common ancestor because of the vertabrates had a skeleton and passed the trait on to all of its descendants.
2. (A) Sharks and Dolphins are very two analogous species.
(B) They are very similar for example, their side fins and their torpedo body shape.
(C) These two species do not share common ancestor. For example, dolphins decend from a Natural Selection. they are mammals from thee sea.
For your homologous pairing, you are comparing the human forelimb to what other organism? You never mention or describe the other animal.
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Description of organisms for your analogous trait (part A)?
Yes, both sharks and dolphins share physical similarities, but why? What environmental pressures have caused these similarities to evolve?
All organisms share a common ancestor if you go back far enough in time. Both the dolphin and the shark are subject to natural selection, so I'm not sure I follow the logic on that. What evidence do we have that at least one of these species developed their body shape independently from the common ancestor. The ancestor of the shark is a cartilagenous fish who would likely have had this body shape. The ancestor of the dolphin was a land mammal. Seems like that might be a good candidate for and organism that developed their traits independently of the common ancestor, i.e., that early fish.