For B I'm confused as to why you would pick either one to be sufficient. Logically, wouldn't the 'habitats being similar to one another' be modified by the Unless Formula as a necessary condition? Leaving the remainder to be sufficient and negated?

An argument’s structure contains premises which support the conclusion.

That is what makes an argument.

However, an argument even with premises that supports a conclusion is not enough to consider an argument strong. The strength of an argument is determined by the logic that follows its reasoning.

interested as well

sign me up!