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erastovalidia [21]
3 years ago
10

Why do organisms require different levels of cellular organization

Biology
1 answer:
Andru [333]3 years ago
4 0
A unicellular organism must perform all functions necessary for life. A multicellular organism has specialized cells, tissues, organs, and organ systems that perform specific functions.
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The principle that the geologic processes that we see today have occurred throughout Earth’s history is called____.
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Answer:

A. Uniformitarianism

Explanation:

The principle of Uniformitarianism was proposed by a Scottish Geologist, James Hutton.

The principle is simply stated as "the present is the key to the past".

The processes that have occurred in geologic past is still in play today. By looking at rock sequences in our present day, we can actually have a firm grasp of the processes they have undergone in the past.

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Which mechanism helps prevent errors during DNA replication?
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Each nucleotide only pairs with one nucleotide
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The bacterium responsible for gastric ulcers, Helicobacter pylori, survives the acidic pH of the stomach surprisingly well. It d
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<em>H. pylori</em> is a bacteria that has the enzyme urease to breakdown urea into ammonia (NH3) & carbon dioxide (CO2). The compound of interest here would be ammonia, or NH3. NH3 is a base, although relatively weak to other stronger bases, which means it has a pH above 7. In the stomach, the pH is acidic, or below 7. By synthesizing ammonia, <em>H. pylori </em>is able to buffer the stomach solution in a manner so that it isn't entirely acidic, but more toward the basic side, thereby allowing for its survival.

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A population of tree frogs lives in a forest. A river runs through the middle of the forest. A particularly snowy winter is foll
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The flooding of half part of the forest have successful separate the population of frogs in that ecosystem into two different set of frogs. This is an example of allopatric speciation, that is, the population become separated as a result of geographical barrier. This separation will make the two set of frog population to become new species. On the long run, the two species may become unable to relate sexually.
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