In the natural world, limiting factors like the availability of food, water, shelter and space can change animal and plant populations. ... Some changes may cause a population to increase. If there are more plants than usual in an area, populations of animals that eat that plant may increase.
Less prey for their predators to feed on which would lead to the predators getting endangered in that ecosystem.
zapped gas/liquid into amino acids
many amino acids thought to have come from meteorites
a mixture of gases and water that Miller thought were present on early Earth was heated and zapped with electricity to mimic lightning. This created five identifiable amino acids
newscientistcom
We know amino acids exist in some kinds of meteorites and interplanetary dust
Many left-handed amino acids were found inside the Murchison meteorite. Most were kinds not found on Earth.
92 different amino acids have been identified in the Murchison meteorite. Of these, only 19 are also found on Earth. The remaining amino acids have no apparent terrestrial source. This discovery led scientists to consider the possibility that Earth's life forms originated elsewhere in the universe. And the same cosmic process that may have helped life arise on Earth could also be seeding life elsewhere in the universe
pbs
https://www.pbs.org/exploringspace/meteorites/murchison/page9.html
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False, the bison survived primarily through inbreeding or just limiting the gene pool due to previous hunting and loss of most viable mates.