Efficiency of a lever is always less than hundred percent. Give reason.

There is no simple minchine on earth(aleast right now) has an efficiency of 100%

Explanation:

Why? Because anything has frictions, according to the AP physic book, that "Friction is the resistance to motion of one object moving relative to another."

btw, your on the wrong subject

<3

Red

sea breeze

explanation:

cool air is going towards land allowing for the land to be cooler, the hotter air gets pushed away from the land.

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.