What is a symbiotic relationship example similar to barnacles on a humpback whale

The relationship between barnacles and whales is a Commensalism relationship where only the barnacles benefit from the relationship but the whales are not harmed. Another example of a Commensalism relationship would be the Remora fish which is a fish that attaches itself to bigger fish and sharks to get a ride to other places, and does not harm the bigger fish nor does it benefit them.

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.