Question

insert dashes where needed.
—
the cradle of humankind a unesco world heritage site that is home to an abundance of early hominid fossils lies in the gauteng province of south africa.

Explanation:

Step1: Identify the first clause break

The phrase "The Cradle of Humankind" is a noun phrase, and the next part "a UNESCO World Heritage Site that is home to an abundance of early hominid fossils" is an appositive clause describing it. So we insert a dash after "Humankind".

Step2: Identify the second clause break

The part "a UNESCO World Heritage Site that is home to an abundance of early hominid fossils" is a descriptive clause, and the next part "lies in the Gauteng province of South Africa" is the main predicate clause. So we insert a dash after "fossils".
<The original sentence with dashes: The Cradle of Humankind - a UNESCO World Heritage Site that is home to an abundance of early hominid fossils - lies in the Gauteng province of South Africa.>

Answer:

The Cradle of Humankind - a UNESCO World Heritage Site that is home to an abundance of early hominid fossils - lies in the Gauteng province of South Africa.