The answer to this question is D. Cells
Having cells, hope this is helps
I think the answer is commensalism because the organism that does the digging is unaffected in relation to the other organism who actually benefits by having an already made home (the hole) for protection & shelter.
Answer :Aneuploidy often results in serious problems such as Turner syndrome, a monosomy in which females may contain all or part of an X chromosome. Monosomy for autosomes is usually lethal in humans and other animals. Klinefelter syndrome is a trisomy genetic disorder in males caused by the presence of one or more X chromosomes. The effects of trisomy are similar to those of monosomy. Down syndrome is the only autosomal trisomy in humans that has a substantial number of survivors one year after birth. Trisomy in chromosome 21 is the cause of Down syndrome; it affects 1 infant in every 800 live births
Explanation:
The RBC are produced in the bone marrow through a process that takes 7 days called erythropoiesis. This is where the stem cells of hemopoietic differentiate into reticulocytes. Iron, Vit B12 and folic are necessary for hemoglobin synthesis. The reticulocytes become functional RBC after 24 hours in the bloodstream.
After 120 days the RBC are destroyed in the spleen through a process called eryptosis. The heme part is broken down into biliverdin and iron. Iron is recycled by the transferrin while biliverdin is excreted through bile.