Questions

It is a Postbox or a Mailbox which contains thousands of letters or mails or messages.

Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.

• Kepler’s three laws of planetary motion can be stated as follows:

(1) All planets move about the Sun in elliptical orbits, having the Sun as one of the foci.

(2) A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.

(3) The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.

Both of them are relation ship constraints

The organs protected by the thoracic cage include the lungs and the heart.

'M' is used as a unit of molarity and stands for mole per litre i.e, number of moles of solute per liter of solution.

Air or gas can build up in the pleural space and when this happens, it's called a pneumothorax.

Hence the given statement is TRUE.