Organisms living at the bottom of a lake are

The organisms which live in the bottom of lake are called:

Organisms found at the bottom of sea are :

Animals living at the bottom of the sea are called

Animals living at the bottom of the sea are called

An air bubble starts rising from the bottom of a lake. Its diameter is 3.6 mm at the bottom and 4mm at the surface. The depth of the lake is 250 cm and the temperature at the surface is 40^@C . The atmospheric pressure is 76 cm of Hg and g=980 cm.s^-2 . What is the temperature at the bottom of the lake?

An air bubble starts rising from the bottom of a lake. Its diameter is 3.6 mm at the bottom and 4mm at the surface. The depth of the lake is 250 cm and the temperature at the surface is 40^@C . The atmospheric pressure is 76 cm of Hg and g=980 cm.s^-2 . What is the pressure at the bottom of the lake?

A pile driven into the bottom of a lake extends 3m above the bottom of a lake and 1m above the surface of water (._amu_omega)=4//3 . If the sun is 30^@ above the horizon, then the length of the shadow of the pile on the bottom is approximately