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How is a leaf constructed or born?
Answer 1:

A leaf is not really "born" but is triggered to happen by many complex chemical reactions taking place within the plant. These chemical reactions take place because the plant's environment is changing. For example, the plant knows it's spring because the length of days change and the temperatures change, and this is how it knows to start sprouting leaves in the spring. For more information on this, check out this neat webpage:

what makes leaves sprout


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