All living things have ____ of the same kind as features in the offspring are inherited from the parents. Due to sexual reproduction, the offspring are not ____ to their parents and vary from each other. Plants and animals have characteristics that make them ____ (adapted) to their environment. If the environment changes rapidly, some variations of a species may not suit the new environment and will ____. If the environment changes slowly, animals and plants with variations that are best suited survive in greater numbers to ____ and pass their characteristics on to their young. Over time, these inherited characteristics become more ____ within the population. Over a very long period of time, these characteristics may be so different to how they were originally that a new species is created. This is called ____.

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