Me what event can have positive effect on the environment ? flood landslide mudslide wildfires

Wildfires is your best choice.

While wildfires can destroy property and kill humans as well as animals, they are a positive effect, because they return nutrients into the ground, and leave behind ashes which are nutrition-rich, needed for new plants to grow.

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primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in

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.