Each time a molecule of DNA undergoes replication, a portion of the molecule is removed and lost. Why is a portion of the molecule lost each time?

telomere replication problem

Explanation:

The telomeres are nucleoprotein structures that act to protect the extremities of linear chromosomes. At each cell division, the telomere becomes shorter due to its incomplete replication by conventional DNA polymerases. This genetic phenomenon is known as the 'telomere replication problem' (also called end-replication problem). Eukaryotic organisms fight against this problem by locating telomeres at the end of each linear chromosome (since telomeres are highly repeated hexameric nucleotide sequences).

i think that it is plants

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.