SCIENCE

3. The force that attracts a body towards the centre of the earth
4. The speed and direction of an object’s motion
6. The process of liquid moving through a semipermeable membrane from a less concentrated solution to a more concentrated solution
9. The process by which green plants transform light energy into chemical energy
11. A subatomic particle of about the same mass as a proton but without an electric charge
13. The tendency of a liquid to resist flow
14. A form of energy that is transferred between systems or objects with different temperatures
15. The quantity of three-dimensional space enclosed by a closed surface
16. The distance between two successive crests of a wave
18. The life-supporting component of the air
20. An astronomical body orbiting a star

1. An organism which uses another organism as a host and feeds off the host for survival
2. The basic building blocks of all living things
5. The degree or intensity of heat present in a substance or object
7. The action of breathing
8. The energy of the motion of an object
10. The remains or impression of a prehistoric plant or animal embedded in rock and preserved in petrified form
12. The smallest particle of a chemical element that can exist
17. A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
19. A property of a physical body and a measure of its resistance to acceleration when a net force is applied