Some strains of bacteria can develop ____ to antibiotics. The non-resistant bacteria are ____ by the ____. The resistant bacteria ____ and pass on their ____ to their ____ - an example of ____. Resistant bacteria ____ and non-resistant bacteria ____ in number. ____ records show the ____ of an ____ over a ____ period of time. Fossils are the remains of ____ from ____ of years ago. They provide ____ of early life. ____ records can provide a useful way of observing a species ____. There is ____ within each ____ for ____, living space, water, ____ etc. The “better ____ members of these species are more likely to ____ – “Survival of the Fittest”. These survivors will pass on their better ____ to their ____ who will also show this beneficial ____. Less ____ organisms eventually ____. Charles ____ wrote: ____ is the ____ change in ____ that happens over a ____ period of time. All life on Earth has ____ from ____ life forms that existed around 3 ____ years ago. Evolution happens through a process called “____” An individual’s ____ can cause ____. For example, human height is ____ controlled but ____ height reached will depend on the ____ available. ____ variation exists because of ____ to chromosomes or ____ (DNA). ____ are a random ____ in the ____ of chromosomes (e.g. Down syndrome) or the ____ of a gene (e.g. cystic fibrosis). ____ organisms are ____ to their ____ in order to ____. ____ is a ____ process of ____ selection that leads to the ____ change of an ____ over time. It may result in the ____ of a new ____. Species are ____ if there are no ____ individuals left. Extinction happens if a ____ fails to ____ to ____ in its environment. ____ have provided us with information on some extinct species.

Natural Selection and Variation

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