Plants show a diversity of forms and play an important role in our lives. They range from bryophytes, the earliest land plants which lack true vascular tissue, to pteridophytes, gymnosperms, and the most diverse group, angiosperms, which produce flowers and fruits. Each group has characteristics like their reproductive structures and life cycles. Many plants are useful for their interactions with other organisms, and provide benefits like food, medicine, household uses, and helping to remove pollutants from the environment. Proper care is needed to support the happiness that plant diversity brings.