The whole cell is surrounded by a membrane, but each individual is also surrounded by a membrane.
a. phospholipid
b. metaphase
c. organelle
d. chromosome

The whole cell is surrounded by a membrane, but each individual organelle is also surrounded by a membrane.

organelle -C.

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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.