Why do frogs croak, what makes them croak, and is it used for mating?

1. The male frogs croak to attract female frogs so that they can mate.

2. Frogs croak by moving air over their vocal cords and causing them to vibrate.

3. Definetly

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.