Final answer:
The tallest plant is a gymnosperm, which includes conifers, cycads, and ginkgoes. They have a well-developed stem and can grow to be very tall.
Step-by-step explanation:
The tallest plant is a gymnosperm. Gymnosperms are a group of seed-producing plants that include conifers, cycads, and ginkgoes. These plants usually have a well-developed stem and can grow to be very tall, such as redwoods and sequoias.
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