Answer:
D. geographic isolation.
Explanation:
As the Grand Canyon formed, it became a physical barrier to the mixing of squirrels from its northern and southern sides. Each squirrel population was confined to a single side. This type of separation is referred to as geographic isolation.
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1. Populations changing over generations
2. Gradual change
3. Speciation
4. Natural selection
5. Common descent
Answer:
An endangered species recovery plan is a document describing the current status, threats and intended methods for increasing rare and endangered species population sizes.
Explanation:
When recovery plans are carried out well, they do not simply act as stop gaps to prevent extinction, but can restore species to a state of health so they are self-sustaining. There is evidence to suggest that the best plans are adaptive and dynamic, responding to changing conditions. However, adaptive management requires the system to be constantly monitored so that changes are identified.[10] Surprisingly this is frequently not done, even for species that have already been red listed.[11] The species must be monitored throughout the recovery period (and beyond) to ensure that the plan is working as intended. The framework for this monitoring should be planned before the start of the implementation, and the details included in the recovery plan. Information on how and when the data will be collected should be supplied.
