The rat. I don't know if you meant zodiac ANIMAL or astrology sign like aquaris for example. however the rat zodiac animal is defined as the weakest of all the zodiac animals.
Have a Merry Christmas,
Miri
Hey the answer to this question is Covalent bond.
Neurone X should be motor neurone.
Motor neurone should be the type of neurone after relay neurone. Impulses travel from the relay neurone then to the motor neurone, and the motor neurone passes messages for the effectors usually in reflex actions, where effectors can be muscles or glands.