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6. If humans descended from monkeys, why are there still monkeys?
This surprisingly common argument reflects several levels of ignorance about evolution.

Indeed it does, which is why AiG advised against using this in this section of Arguments we think creationists should NOT use. In the paragraph quoted next, Rennie makes the same mistake as many do concerning the common ancestor, but he does realise the main problem with this argument.

The first mistake is that evolution does not teach that humans descended from monkeys; it states that both have a common ancestor.

Which, according to G.G. Simpson and Gould would be called an ape or a monkey by anyone who saw it, so it’s just a petty criticism of those who say this.

The deeper error is that this objection is tantamount to asking, ‘If children descended from adults, why are there still adults?’ New species evolve by splintering off from established ones, when populations of organisms become isolated from the main branch of their family and acquire sufficient differences to remain forever distinct. The parent species may survive indefinitely thereafter, or it may become extinct.

As Answers in Genesis pointed out!