Final answer:
The plant with non-clustered flowers and a deep brown center that Soo Hwan found is likely the purple coneflower (Echinacea purpurea), which is part of the diverse and successful group of flowering plants.
Step-by-step explanation:
Based on the description provided, the type of plant Soo Hwan found with flowers not clustered and a deep brown center is likely to be related to the purple coneflower (Echinacea purpurea). This species is known for solitary flower heads and a distinctive, raised central cone that can appear dark or brownish in color. To determine which group a particular plant belongs to, botanists use various plant characteristics, such as the presence of roots, stems, flowers, or seeds, as well as specific plant structures and reproductive features. Flowering plants, or Angiosperms, are incredibly diverse and are the most successful type of plant partly due to their specialized structures that facilitate pollination and reproduction. In a Japanese garden, for example, one might observe numerous types of plants, including diverse flowering plants.