Fill in the blanks with appropriate prepositions

Hi Elif, let's solve this multiple-choice question where we need to find the correct prepositions to complete the sentence about molecular biology.

Let's read the full sentence first to understand the context. It says: Molecular biologists claim that hereditary characteristics are passed down blank the transfer of DNA and RNA base pairs blank the same fundamental replication machinery that explains all life processes blank eukaryotes.

Let's focus on the first blank. The sentence describes the mechanism by which characteristics are passed down. When we talk about a method or means of transmission, the preposition through is commonly used.

Now let's look at the second blank. The sentence mentions life processes occurring within a specific group, in this case, eukaryotes. When we talk about something being located inside or occurring within a biological group, the preposition in is most appropriate.