The formation of blood cells is a complex process. in most cases, the cells have been transformed ("morphed") from a previous cell type. the precursor cells from which each individual type of blood cell is formed through a series of maturation steps are called

The correct answer will be- Blast cells

Explanation:

Blasts are the poorly differentiated cells which act as precursors to the circulating mature blood cells. The blast cells act as precursors to neutrophils, monocytes, erythrocytes and lymphocytes.

The blast cells are usually found in high number in circulating blood as compared to bone marrow. These cells can be characterized as they show a single round nucleus, smooth chromatin with more than one nucleoli and high N: C ratio.

Thus, Blast cell is the correct answer.

i believe the correct answer is d

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.