понедельник, 18 марта 2019 г.

Essays --

Animals have always been evolving and are constantly adapting to their changing surrounds. All organisms have a bun in the oven the intake of food and disposal of waste, the exchange of carbon dioxide and oxygen, and respiratory gases. To sic how much of this each organism needs, it is based on each organisms volume. Organisms are able to exchange materials the fastest when the surface-to-volume relationship is tumid. Because liberalr organisms have a smaller surface-to-volume relationship, the exchange of materials and the ability to lose disturb is more difficult. Organisms have changed from single, to multicellular. A single celled organism has a large surface-to-volume ratio, which means it is able to efficiently exchange and remove materials. As these organisms assume over time and grow larger, they eventually become multicellular and must increase their surface area. Sea Anemones and Tapeworms are a perfect role model of this as they have elongated, flat bodie s. Thus, the diffusion between the organism and its environment only require a short time. Question 2The divers(a) structures of porifera include Asconoid, Syconoid and Leuconoid. Asconoids have the simplest structures, an atrium lined with collar cells. Incurrent ostia allow water presently into the chamber. Asconoids eventually increased the thickness of their luggage compartment wall and became Syconoids. Syconoids have choanocyte chambers that extend into the body wall. An even thicker body wall was created and Syconoids evolved into the most complex structure, the Leuconoid. Leuconoids have choanocyte chambers isolated deep within a body wall. Incurrent and excurrent canals lead to them from the outside, which then leads to the atrium. With each organ exchanging unique(predicate) ... ... development was muscle tissue. The platyhelmiths are the first animal with true musculature. sinew from the mesoderm is attached to the endoderm and ectoderm. Endoderm mus cles line the pharynx and are surrounded by muscles that allow it to be extended, withdrawn and suck in food. There are also longitudinal muscle fibers that allow the body to elongate and perform the various turning and bending activities of the worm. A protonephridium is a network of dead-ending tubules, also known as flame cells, that function is osmoregulation and ionoregulation. to each one cell has one or more cilia and their beating creates an outward exhalation current and pressurization. The pressure created drives waste fluids from the inside of the animal to the protonephridium. The terminals are large enough for small molecules to pass through, but larger proteins are kept in the animal.

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