Gas "floats" so if there are examples or pictures it would be the one with the most evenly spread out "dots".
A substance made up of only one type of element
Answer:
fluid transfer of heat by the motion of the particles of gas or fluid
Answer:Racquet force is twice of Player force
Explanation:
Given
ball arrives at a speed of 
ball returned with speed of 
average Force imparted by racquet on the ball is given by

where 
time of contact of ball with racquet


When it land on the player hand its final velocity becomes zero and time of contact is same as of racquet


From 1 and 2 we get

Hence the magnitude of Force by racquet is twice the Force by player
I think it's The fossil record. The same animal fossil is in Africa and South America. The animal could have not swim across so its the fossil record