Rosalind Franklin contributed to the understanding of DNA by discovering It's shape and structure.
Answer:
contractile vacuole
Explanation:
contractile vacuole is used for balance of water,salt etc
It's empty or fairly large, making the sounds from your hands bounce of the walls and therefore having it echo
Answer:
a
Explanation:
The ice cream melting is an example of thermal energy, because the heat of the sun is melting the ice cream
hope it helps