Answer:
organisms eat food because they will die if they don't, just like us humans. their bodies wont be able to run if they do not have a energy supply. the energy supply for every organism is food. this is why organisms eat food.
Answer:
The final volume is 
Explanation:
<u>Data:</u>
Initial temperature:
Final temperature: 
Initial pressure: 
Final pressure: 
Initial volume:
Final volume: 
Assuming hydrogen gas as a perfect gas it satisfies the perfect gas equation:
(1)
With P the pressure, V the volume, T the temperature, R the perfect gas constant and n the number of moles. If no gas escapes the number of moles of the gas remain constant so the right side of equation (1) is a constant, that allows to equate:

Subscript 2 referring to final state and 1 to initial state.
solving for V2:


Answer
Acceleration
Acceleration Means rate of Change of velocity with respect to time.
acceleration due to gravity
when a body falls freely means no other force act on it except gravitational force that time velocity of object does not remains constant but it changes as it approaches towards the ground it means body get accelerated and this acceleration which is gained by the body due to gravitational force is called its acceleration due to gravity it is denoted by g. Acceleration due to gravity is different on different planet. SI unit of is m/s^2 . On earth its standard value is 9.80665m/s^2.