This is the genus that includes modern humans and species closely related to them and is estimated to be about 2.3 to 2.4 million years old.

Ans.

The modern humans (Homo sapiens) are grouped into genus Homo, which includes several other extinct species of ancestral species of modern humans, such as Homo erectus.

The first member of genus Homo was Homo erectus, which appeared in east Africa about 2.3 to 2.4 million years ago. Homo erectus is ancestral species of Homo sapiens, from which they evolved around 3.5 million years ago by the speciation.

Thus, the correct answer is genus 'Homo.'

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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but there is no

i guess you forgot putting it.