Why is primase required for dna replication?

Primase is a DNA dependent RNA polymerase. It adds RNA primer to the DNA strand and lay the foundation of DNA replication.

It is important because DNA polymerase can add nucleotides to the 3'- end of the strand.

Primase, in the form of RNA primers provide free 3'- end to the DNA polymerase and thus, help in initiating DNA replication.

At the end of replication RNA primers are removed by DNA polymerase I.

the answer to your question is b

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.