Question

The mars rover collected round clumps of crystals that, on earth, usually form in what?

Answer 1

water

The ice ages were very recent as Earth history goes. The animals are familiar, but they're still very different from modern ones. For one thing, most of them were huge. A small surface area-to-volume ratio is better for keeping warm  less surface to lose heat from . Although the dominant animals were mammals, the Pleistocene Earth still does not look quite modern.