1. When a gene ____, it can lead to a new characteristic that can help a species survive. 2. A species ____ as it adapts to changing conditions in the ____. 3. ____ is a process in which the remains of animals and plants are preserved in rock. 4. When a species cannot adapt to changing conditions, it may become ____. 5. The hummingbird's long beak is an ____ that enables them to reach nectar in flowers. 6. ____ is the process by which the individuals best adapted to their environment are more likely to reproduce and live longer.

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