Please choose the correct answer to the question: Nicole was studying different ecosystems. She compared the number of plants living in a forest to those in a desert. Which factor best explains why more plants may survive in a forest?

Answer1: There is more rain in the forest. Answer2: There is more oxygen in the forest. Answer3: There is more sunlight in the forest. Answer4: There is more competition in the forest.

Answer format: answer1/answer2/answer3/answer4