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jasenka [17]
3 years ago
10

How dome some cells become brain cells and others become skin cells, when the DNA in all the cells is exactly the same. In other

words, if the instruction are exactly the same, how does one cell become a brain cell and another a skin cell?
Biology
1 answer:
bezimeni [28]3 years ago
8 0
All multicellular organisms develop from a single fertilized egg cell known as a zygote.  As this cell divides by mitosis, each new cell that is formed contains the exact same genetic material.  As the organism develop certain genes in certain cells are activated and others are inactivated so that cells develop into specialized cells such as brain cells and skin cells.
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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.

Therefore, option A. change in environment, option B. natural selection and option E. chances of survival are the correct statements.

Learn more about the natural selection here:

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A molted external skeleton. 
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d health

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■ Encourage the students to understand their

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2 Chapter 1 ■ The Food You Eat

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Have you ever wondered how the food you eat fuels your body?

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Adequate nutrition can help prevent certain diseases, maintain an

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In This Chapter,

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The actual genetic makeup of an individual is the?
nataly862011 [7]
The actual genetic makeup of an individual is its genotype.
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3 years ago
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