Please choose the correct answer to the question: Two identical plants are planted 3 meters apart. One plant is flowering, but the other is not. A student concludes that the plants are receiving an unequal supply of water. Another possible explanation the other plant is not flowering is that the plants are

Answer1: too close to one another. Answer2: receiving different amounts of sunlight. Answer3: in soil with high humus content. Answer4: receiving different amounts of carbon dioxide.

Answer format: answer1/answer2/answer3/answer4