Why are protists not considered a clade?

Answer 1

Protists are diverse and do not have one exclusive common ancestor.

Protists are diverse and do not have one exclusive common ancestor. This is an informal term that is no longer representative of current scientific knowledge.

A clade is a group of organisms that we believe evolved from a common ancestor, thus protists do not fit into one single clade.

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Answer 2

Ivy Acosta

Protists are not considered a clade because they do not share a common ancestor exclusive to them. Instead, they are a diverse group of eukaryotic microorganisms that include multiple lineages with different evolutionary histories.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.