Dr. jekyll needed which of these ingredients to make another batch of his potion?

The ingredient that Dr. Jekyll thought that he needed is salt to make another batch of his potion. However, he found out later that it was not this ingredient but the impurity in it that was the vital chemical in his potion.

b. climate change will cause an increase in biodiversity of all ecosystems.

hope this

increases the risk of extinction 

explanation:

the answer is that if the species suffers from the disease, there is nothing stronger than the others, so it is possible to remove wholeness. an example of this is hunger in irish potatoes, which has a deadly disease bearish part of all potato harvest masses. pretty much ruins the land of crops.