why flowers are coloured ?

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why hair is black

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How we are able to talk

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How people get heart attack

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Flowers are coloured and hairs are black due to the presence of pigments in them. You will study them in detail in higher classes.

We are able to talk because of tongue and mouth. It also involves a voice box present in our throat. You will study the whole mechanism of producing a sound in higher classes

The question about heart attack is beyond the scope of your syllabus considering your grade. You will study it in higher classes.