Comments by "mpetersen6" (@mpetersen6) on "What if Grass never Existed?" video.

  1. Mules are not a species of Equine. They're a mostly sterile hybrid of horses and donkeys. Usually a Male donkey matesd to a female horse. It is possible to use a Male horse and female donkey but the chance of offspring is lower. Donkeys and horses have to have separated from a common ancestor recently enough to allow them to interbreed but due to different chromosome counts they are rarely fertile. It is rare but there occasionally female mules able to breed. These are also other "mules" such as donkey/zebra. Additionally there are similiar cross between Zebra and other Equine species https://en.wikipedia.org/wiki/Mule https://en.m.wikipedia.org/wiki/Hybrid_vigor https://en.m.wikipedia.org/wiki/Zebroid
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  2. According to Wikipedia (yah I know but they have links to source material) there are indications that grasses date to at least the Early Cretaceous. Fossils found in corpolites from India and China from this time period indicate the existence of primitive grasses https://en.wikipedia.org/wiki/Grass https://doi.org/10.1093/nsr/nwx145 https://en.m.wikipedia.org/wiki/PMID_(identifier) https://doi.org/10.1038/ncomms1482
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