I know it's long but I hope it helps you (•‿•)
DNA replicates into RNA molecule after transcription using one of its strand as a template.
Explanation:
The Transcription is the process of RNA molecule formation and it involves three steps in it, which are namely, initiation, followed by elongation and at the end is the termination.
The DNA strand taken for the transcription is unwinded by the help of the enzyme which provides for the template. The template helps in the formation of complementary base pairing which results into the mRNA molecule. The RNA molecule thus, formed is processed after.
The X can possibly be the sex chromosome. Like for human female we have the XX chromosomes and when the allele is on the X chromosome we write as X with a R as the superscript on top right.
Secondary succession because it was previously abandoned but since its been found theres a new ecosystem growing . ( u could word it a bit differently but it’s definitely secondary succession )