he cell cycle is essential for ensuring that our cells don't grow too large. Explain why it is necessary for cells to remain small in size.

it is necessary for cells to remain small in size because they need to keep a surface area to volume ratio that allows for adequate intake of nutrients and exchanging materials between the inside and outside of cells.

Cells are small so they can have an efficient surface area to volume ratio. This is going to allow the cell to easily excrete waste product.

That is why the cell needs to be small. The smaller it is, the larger the surface area to volume ratio is.

it has one origin of replication, but it proceeds in two directions - 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.