Read the paragraph below, look for the big idea.
Many flowers are what we call annuals. Their entire life cycle — from seed to death — takes just one year. They might leave behind sleeping seeds that could sprout again in the future, but the flowers, roots, stems and leaves all fade away as soon as the season is done. Sunflowers and petunias are examples of annuals. Some plants technically last a little longer, but not in a way humans can truly appreciate. Biennials take two years to start flowering instead of shooting up in a single spring. But they still wither and die once the flowers are gone. One to look for is a foxglove, a tall plant with clusters of bell-shaped blooms, often in pink or purple. Then there are perennials, which can survive for years. Scientists believe these types of plants came first.
What is the main idea the author is trying to make about plants?
Perennials are a special type of plant
Scientists think perennials are the first type of plant that existed.
Plants have different life cycles depending on the type of plant.
There are different names for plants