Birds have hollow bones due to the fact thay need to be as light as possible for their wings to generate enough lift for them to fly
From an area of high concentration to an area of low concentration.
One of the 4 nucleic acid bases. They connect the two strands of the DNA double strand by means of hydrogen bonds, the principle of so-called complementarity of bases. derived from pyrimidine. It is part of nucleic acids, where it forms a complementary pair with guanine using three hydrogen bonds.
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