These pictures compare the numbers of prairie dogs in an area at two different times the picture on the right shows the area 10 years after the picture on the left

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

amber has allowed scientists to study dna that has been preserved over millions of years.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

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explanation:

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