An ATM is an Automatic Teller Machine. You put your keycard or credit card into it to deposit or withdraw money.
Buddhism is a religion that started in India somewhere between the 6th and 4th centuries BC. Buddhism was founded by a man called Siddhartha Gautama, or Buddha. Buddhists can be found mainly in south-east Asia in countries like China, Burma, Japan and Tibet. Buddhists believe that you can end the suffering of life by eliminating ignorance, craving, hatred, and reaching a higher level of understanding. Once you have embraced the ideals of the Buddhist religion, you will reach the highest state of happiness, nirvana.
An organism is anything that is alive and able to grow and reproduce. The organism in the picture is a jellyfish.
A prism is a clear, solid object, usually shaped with a triangle on the top and bottom and straight sides. Prisms are used to change the direction of light, or to split it up into its colours like a rainbow.