Zoology Relics of Human Evolution Essay

Pages: 3 (1111 words)  ·  Bibliography Sources: 3  ·  File: .docx  ·  Topic: Anatomy

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But the big toe in humans can only really be used for balance while walking upright or standing.

Coccyx. These fused vertebrae are all that is left of the tail that most mammals still use for balance and communication. Tails are not needed in humans because they walk upright and spend less time in trees than their primates.

Paranasal sinuses. These nasal sinuses may help to capture bacteria and viruses as they are lined with mucus. The also make the head lighter and to warm and moisten the air we breathe. The sinuses of our early ancestors may have helped with survival if they were lined with odor receptors that gave a heightened sense of smell.

Bioluminescence

Fireflies. Lightening bugs or fireflies are known for their crepuscular use of bioluminescence to attract mates or prey. The bioluminescence produced by fireflies is a cold light that does not have any ultraviolet or infrared frequencies. The light is produced chemically and the color may be perceived as yellow, pale red, or green. The wavelengths of the light range from 510 to 670 nanometers.

Anglerfish. The anglerfish that live in the bathypelagic zone emit light from their escas that serves to attract prey. The bioluminescence is produced through symbiosis with bacteria. The exact mechanism by which the bacteria enter the escas is not known. Notably, the bacteria population can become very dense as they multiply within the esca. As a result, the light emitted from them can be a very bright glow.

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Latia neritoides. Latia neritoides is a small freshwater snail or limpet that occurs only in streams in New Zealand. As an aquatic gastropod mollusk, it is a member of the family Latiidae. This snail is bioluminescent and phosphorescent and its light-emitting system is believed to be unique. It is the only freshwater gastropod that emits light and the mechanism, and the structures of the luciferin and luciferase, are not entirely clear.

TOPIC: Essay on Zoology Relics of Human Evolution Assignment

Squid. The Taningia Danae is a squid that has gigantic yellow photophores on the end of its two arms. These are the largest light-producing organs known to exist on any animal. The photophores are lemon-colored and about the size of lemons. Since the photophores have a black membrane that functions like an eyelid, and can be opened and closed, the photophores can be flashed at will.

Extinct Animals

Steller's sea cow. The Steller's sea cow or Hydrodamalis gigas was a large herbivorous marine animal of the order Sirenia. Its closest living relatives are the manatees and the dugong. The sea cow was abundant throughout the North Pacific, but because it was such a slow-moving animal, it was hunted to extinction within 27 years. It was first described by Georg Wilhelm Steller, an expedition naturalist, in 1741. An average weight was about 8 to 10 tons. It looked much like a large seal but had two forelimbs, a whale-like fluke, no actual teeth (just flat wide bony plates top and bottom), thick and black skin, with a head small in proportion to its body. The Stellar sea cow did not come to shore, but remained in the sea though it could not submerge. The aboriginal hunting of sea otters may have increased sea urchins, which would have reduced the amount of kelp available to the Stellar's sea cow -- kelp was its primary food… [END OF PREVIEW] . . . READ MORE

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"Zoology Relics of Human Evolution."  Essaytown.com.  November 10, 2012.  Accessed September 25, 2021.
https://www.essaytown.com/subjects/paper/zoology-relics-human-evolution/9780122.