Why does it use comma in this sentence?

I can think of two justifications. The first is that the clause "and when we need to" is an aside. Those, as I learned long ago, are set off by commas. The second is to avoid confusing the reader with a potential compound predicate: "we can and will," say.

But the real reason is that the author is trying to punctuate his way out of the bind of his own syntax. This sentence should read

Ops In But on the flipside from an evolutionary point of view the reason we are so successful and we're still here is because we can, and when we need to, react aggressively to situations.It was confused. Could you help me?

I see it as a list of 'clause items' put into an order, hence commas. Equally, you can put "and when we need to" into brackets in that sen

tkacka15I see it as a list of 'clause items' put into an order

I don't see it. Which clauses make up your list of "clause items"?

tkacka15two equal grammatical units (clauses)

This requires rewriting the complement as "because we can react aggressively and because we do react aggressively." This seems unlikely as an equiva

deadratThis requires rewriting the complement as "because we can react aggressively and because we do react aggressively." This seems unlikely as an equivalent to me.

I assume that such a rewriting is implied. But I agree that it is a question of interpretation; I see it from outside, as a non-native, thus my understanding of that may be somehow contaminated b