Final answer:
The retroelements in the human genome can be ranked in decreasing order of abundance as follows: retraction (1300), retrovirus (876), reverse transcriptase (876).
Step-by-step explanation:
The retroelements in the human genome can be ranked in decreasing order of abundance as follows:
- Retraction - 1300
- Retrovirus - 876
- Reverse transcriptase - 876
Retraction is the most abundant retroelement with 1300 occurrences, followed by retrovirus and reverse transcriptase with 876 occurrences each.