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Regressive evolution proposes that viruses descend from free-living and more complex parasites. According to this theory, ancestral viruses developed a growing dependence on host-cell intracellular ‘‘machinery’’ through evolutionary time, while retaining the ability to auto-replicate, like mitochondria that have their … Full sample
The animal I have chosen for this topic is the Arctic Polar Bear. The polar bear is a unique species in that it is only found in the natural environment at latitudes above 66’33N. The average temperature in the warm … Full sample
A great diversity of cell types, tissues, and organs were able to develop mostly due to the lack of firm cell walls. A cancer cell is a great example of how uncontrollable the growth of cells might be. Cancer can … Full sample
Brittle stars, which are sometimes called serpent stars, are long-armed, spiny animals that live on the sea floors, disregarding its depth. Brittle stars are not fish, but are related to starfish. These animals without back bones, cold-blooded, with their temperature … Full sample
Heterotrophs are regarded as consumers that obtain carbon by means of eating other heterotrophs or autotrophs, rather than obtaining it from energy of light or inorganic oxidation. Basically, all animals are heterotrophs. In order for a particular species to be … Full sample
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