Suppose you are at a party, and one of your human friends decides to run around...

Suppose you are at a party, and one of your human friends decides to run around the room screaming "I'm a jawed fish." It's not a costume party, so the other guests look at your friend a bit oddly-- actually a lot oddly-- and they edge away. But you stand up and say that your friend is right. Assuming that the other partygoers are trained in phylogenetic systematics, what argument could you make to convince them? Your answer will be most convincing if it is constructed in complete sentences and uses specific and appropriate terms (spelled correctly); you could also use figures to help illustrate the point you are making.

Expert Solution

Life has evolved on earth from simple organisms to most complex organisms.Lampreys, jaw Fish, amphibians, reptiles, aves and mammals all of them are vertebrates. Lampreys do not have jaws, they belong to Agnatha group. These have evolved in to GNAthostomata which have jaws. All other vertebrates come under Gnathostomata. First organisms to evolve are fish such as Chondrichthyes and Osteichthyes. These are fish with fins and gills. Gradually, the fins got evolved in to limbs and gills replaced by lungs and the fish evolved in to Amphibians. Amphibians which are water dependent for reproduction evolved in to reptiles which can reproduce on dry land because they have an amniotic egg which can protect their embryo.Reptiles later evolved in to aves and mammals. HUamn beings are mammals. Mammals are most evolved organisms with mammary glands, vivipary and enlarged brain. Humans have maximum size of the brain and most intelligent of all.

So Jaw fish are our ultimate ancestors among vertebrates. That is why we can say that we are all descendents of fish.

The above is the phylogenetic tree of the vertebrates, showing how humans have evolved from jaw fish.

gladiator answered 6 months ago

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