1) The sunflower is not a single flower but a cluster of small flowers arranged in a spiral pattern.

2) Brad Pitt is an American actor and film producer. He has starred in a wide range of films, including "Fight Club," "Inglourious Basterds," and "Once Upon a Time in Hollywood," and has received critical acclaim and numerous awards for his performances.

3) The study of fossils is called paleontology, and it helps us understand the history of life on Earth and the process of evolution.

4) The hibiscus flower is commonly associated with tropical regions and is the national flower of several countries, including Malaysia, South Korea, and Haiti.