After all this info you have given me, the correct one is Keystone species. As defined in sources like National Geographic, <span> These are types of plants or animals that play a unique and crucial role in the way an ecosystem functions. Without </span>keystone species<span>, the ecosystem would be dramatically different or cease to exist altogether. I hope this helps you a lot </span>
<span>These three adaptations make sure of the success of prokaryotes.
It is fast reproduction make organisms to out-compete other organisms by sheer
numbers then asexual reproduction give way to the organism to take no risk in
change if the environment is constant and Cell walls help prokaryotes resist
harsh conditions.</span>
measures a person's blood pressure when the heart contracts and relaxes
hope this helps
Toxins in the soil would enter through the root system first.
