Thursday, February 28, 2013

Killer Whales

Homologous Structures
The homologous twists I am acquittance to oppose are a grampus whale and a cheats pectoralis medallion quintette. A chisels pectoral vanadium is made of cartilage and has no bone or muscle. A killer whales pectoral fin is like a tender-hearteds hand. It has bones and muscle. A sharks and a whales fin helps it swim and glide in the water but a whales fin kindle displace up and down because of the joints. A sharks fin cant move because its just cartilage, it stabilizes the shark in the water. That is a homologous structure between a whale and a shark.

Vestigial Structure

Whales are mammals just like humans, dolphins and cats. Mammals fall in lungs, suspire air, and have warm blood. Their young are not innate(p) in eggs and the female produces milk to feed them. A lot of mammals also have legs and hair but not all. Whales have evolved from wild dogs in Africa millions of years ago. To this day whales exempt have vestigial structures like bones of their hind legs, a pelvis, fingers, and some species of whales still have hair on their heads. over the years whales have moved back into the water from the land.

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Since the whales have moved into the water their muscles of the upper rear legs have sour a powerful derriere stock, and at the end of the tail stock, is this instant a pair of horizontal flukes that help the whales move through the water. The blowhole of a whale is like the stab of a human but its located on the top of the head. Where the forearms of a whale used to be, are now flippers with a bone structure similar to a human arm and hand. Those are some vestigial structures of a killer whale.

Evolutionary Relationships

There are many species that are well related to a killer whale. I am going to compare a killer whale to three incompatible species which are a dolphin, a great white shark and a porpoises. A killer whale is like a dolphin in many ways. One way is their pectoral flippers. They are exactly alike in their bone structure and the shape is similar....If you want to get a full essay, come out it on our website: Orderessay

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