In the embryo and fetus it takes place in a variety of sites including the liver, spleen, thymus, lymph nodes, and bone marrow; from birth throughout the rest of life it is mainly in the bone marrow with a small amount occurring in lymph nodes. Called also hematogenesis, hemogenesis, and hemopoiesis. extramedullary hematopoiesis the formation and development of blood cells outside the bone marrow, as in the spleen, liver, and lymph nodes.
Furthermore the taxon Monera is paraphyletic. The term moneran is the informal name of members of this group and is still sometimes used (as is the term prokaryote) to denote a member of either domain.
After an in-depth study of the characteristics of Monera kingdom, it was divided into two groups archaea and bacteria. This classification of living beings was under the three-domain system of taxonomy that was established in 1991. The third domain included the Eukaryote group. The source of nutrition for these organisms is usually photosynthesis or chemosynthesis. 2  The characteristics also include the shape of the cell that includes round (cocci), rod-like (bacilli), or spiral (spirochetes or spirilla).