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How many times does DNA replicate in meiosis?

Meiosis refers to eukaryotic cell division, which constructs gametes or sex cells from diploid cells. A gamete contains one copy of every chromosome. Two copies of every chromosome are in a diploid cell.Meiosis is comprised of DNA replication and two successive cellular and nuclear divisions. It can be broken into two key stages: meiosis I and meiosis II. Both of them can be further divided into prophase, metaphase, anaphase and telophase stages. Most of meiosis's key processes occur during prophase I.

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What is Australia's human-environment interaction?

Australia has many examples of human-environment interaction throughout its history, from the Aborigines to the spread of weeds. The Aborigines both used and modified the land to suit their needs. They regularly burned the vegetation from the land in different patterns to help control or prevent wild fires. They completely cleared an area known as the Old Sports Ground as a gathering place for clans. Once the Europeans arrived, this interaction altered in ways that ranged from a modest modification of the environment to complete eradication due to overgrazing.\nAnother example of human-environ..

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What is the total area of 12 mm x 10 mm?

In this instance, 12 is multiplied by 10 and millimeters by millimeters. Whenever a unit of measurement is multiplied by itself, the answer is the unit squared. One inch is the equivalent of 25.4 millimeters, so the area described above is the equivalent of approximately 0.183 square inches. Dividing 12 millimeters by 25.4 millimeters per inch yields 0.472 inches, and dividing 10 millimeters by 25.4 millimeters per inch gives 0.394 inches. Multiplying the two values in inches together yields 0.183 square inches.

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What is the purpose of crystal violet in a Gram stain?

Gram's staining is used when a sample of bacteria needs to be differentiated into two groups: gram-positive and gram-negative. It is used to detect infections in samples of bodily fluids and can be used more quickly than culturing the bacteria, when the length of time to diagnose an illness is integral to treating the patient.

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What gas does limewater test for?

Climate change scientists and researchers believe that lime could help counteract some of the problems facing the environment, according to The Guardian. Rising levels of acidity as a result of man-made carbon dioxide emissions could be counteracted by converting limestone to lime and introducing the lime to the ocean water. The reaction of the lime with carbon dioxide creates bicarbonate ions that could help the ocean water absorb more carbon dioxide.

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How do I do a "why is the sky blue" science project?

The phenomenon of scattering of light, known as Rayleigh scattering, is responsible for the blue color of the sky during the day and the reddish-orange color of sunsets and sunrises. The air in Earth's atmosphere scatters the shorter wavelengths of light, which is the blue end of the visible spectrum, a lot more effectively than the longer wavelengths, which form the red end of visible spectrum. This is why the beam of light in the project appears bluish-white from the sides. The blue light has been scattered more and can reach the eyes, which is why the sky is blue during the day.\nIf th..

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Why does rubbing alcohol feel cold?

When a substance changes from one state to another that has a higher energy level (as in melting from a solid to a liquid or evaporating from a liquid to a gas), it absorbs the heat energy around it. The opposite happens when steam condenses into water, as this reaction releases heat, which is why steam causes such painful burns.

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What do plants need to live?

Plants use a process called photosynthesis to create their own food. This process requires sunlight and a cell pigment called chlorophyll, which gives plants their green hue. A lack of adequate sunlight often causes plants to produce less fruits or flowers, and it can weaken the plant. Poor air quality can also prevent photosynthesis, as plants need to be able to take in carbon dioxide from the air to complete the photosynthesis process.\nPlants require healthy soil in order to receive nutrients that are necessary for survival. The soil also keeps the plant firmly grounded. Providing fertilize..

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What are some examples of a dicot flower?

Dicotyledons have two embryonic leaves, or cotyledons. Cotyledons are seed leaves produced by the embryo that absorb nutrients packaged in the seed until the plant is able to produce its first true leaves and begin photosynthesis. Monocotyledons have only one cotyledon. Monocotyledons consist of the rest of the angiosperms, about 60,000 species in all.\nThe number of cotyledons found in the embryo is the basis for differentiating the two classes of angiosperms, but they have many more distinguishing characteristics. Monocotyledons are monosulcate, meaning they have pollen with a single furrow ..

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What are some options for viewing a 2014 calendar?

In addition to showing the holiday dates for the United States, the calendar at Timeanddate.com also displays moon phases and typical non-working days. Holidays appear in red, and non-working days are grayed out. The moon phases of a month appear right below the days.\nBoth Windows 10 and Mac OS X feature free calendar applications. To open the calendar in Windows 10, click Search Windows on the taskbar, and type "calendar." Click Calendar to open to application.\nOn a Mac, open the Calendar app by clicking its icon on the Dock at the bottom of the screen. If the application is not on the Dock..

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