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IrinaK [193]
3 years ago
5

Explain how Darwin’s theory of evolution by natural selection may have led to all giraffes having long necks.

Biology
1 answer:
juin [17]3 years ago
3 0

Answer:

Because this individual had a longer neck, it was able to reach food sources that other animals couldn't...

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Typically, urea broth is filter-sterilized because autoclaving breaks down the urea. However, even unsterilized broth rarely pro
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When organisms use urea, ammonia is generated during incubation, which makes the reaction of these media alkaline

Explanation:

Urea broth preparation:

Suspend 3.87 grams of the medium in 100 ml of distilled water without heating. When the powder dissolves, sterilize by filtration. Dispense quantities of 0.5 to 2 ml in small sterile tubes. Larger volumes may be used but the reactions will be slower. Do not sterilize in autoclave.

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