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On the island there is competition for lower lying grasses and no competition for higher bushes.Because of natural variation some tortoises have longer necks, which enables them to reach the higher bushes...
Our skin surrounds almost all parts of our body and can act as a mechanical barrier between microorganisms and our body. If the skin is damaged or cut, a scab will be formed to prevent microorganisms from...
The heart is a muscle made up of myocytes, which can contract without any innervation or coordination. However, it is important that the heart contraction is controlled and regulated in a way which can re...
Meiosis occurs in the ovaries or testes to produce gametes. Gametes are sex cells such as an egg cell or sperm cell. Four cells are produced by this process and they are non identical. Mitosis occurs thro...
Meiosis produces 4 daughter cells from the original parent cell. These cells are haploid cells- they have half the number of chromosomes that the parent cell, and the process creates gametes for sexual re...
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