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Natasha_Volkova [10]
3 years ago
7

Cells are the basic structural and functional units of life. This statement is

Biology
1 answer:
Sedbober [7]3 years ago
4 0
<h2>Scientific Theory of Cells</h2>

The scientific theory of cells, also referred ‘Unified Cell Theory’ or ‘Unifying Principle of Biology‘ was proposed by scientists like Theodor Schwann, Matthias Schleiden, and Rudolph Virchow.

Explanation:

The basic principles of this theory are:

  1. All living or biological organisms, unicellular or multicellular, are composed of one or more number of cells accordingly.
  2. Cells are the ‘basic unit of life’.
  3. Life begins from cells and new cells are reproduced from ‘pre-existing cells’.

An organism is unicellular if it has a single cell like the amoeba, paramecium etc. An organism is multicellular if it has multiple cells like birds, reptiles, human beings, etc. A single cell can be simple or complex but any living organism is essentially composed of at least a single cell.

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Mussels are molluscans and are freshwater animals. The change in the environment led to new traits of mussels, it underwent natural selection and the thick shells have high chances of survival.

<h3>What is natural selection?</h3>

Natural selection is a process of nature that eliminates the organism with less survival and unfit traits while selecting the organisms with better traits of survival in the altered conditions.

The arrival or the introduction of the crabs in the environment altered the previous habitat of the mussels and led to the adaptation of the better trait quality in the mussel species.

The trait of the thick shells underwent natural selection as they were favoured for the changed conditions. The mussel having thick shells have high chances of survival over thin-shelled mussels as the crab will find it hard to attack the thick-shelled mussels.

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Learn more about the natural selection here:

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Why can a wolf be considered both a secondary consumer and a tertiary consumer
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