Final answer:
Insert the detailed sentence regarding the mammoths' death due to environmental changes after sentence 22 to enhance the understanding of the climate change impact within the context provided.
Step-by-step explanation:
The best place to insert the sentence 'Although the temperatures were only slightly different, the changes may have greatly affected rainfall, soil, and plant and animal growth, ultimately leading to the mammoths' death', is after sentence 22. This placement is appropriate as it would follow any initial statements regarding the broad impacts of climate change on habitats during the period being discussed, enhancing the reader's understanding by providing a specific example of the mammoths' situation. The following sentences would then be able to build on this detailed information to provide evidence or additional explanation.