Please choose the correct answer to the question: A meeting of scientists, called a symposium, occurs every year to share recent research about the atmosphere of Earth. This symposium mainly serves which purpose in science?

Answer1: to test research methods used by other scientists Answer2: to develop questions about space research Answer3: to discuss the meaning of new discoveries Answer4: to explain gas properties to the general public

Answer format: answer1/answer2/answer3/answer4