Plant, any member of the plant kingdom—a realm of nature made up largely of living organisms that make their own food. Plant life in general is called vegetation. Flora refers to the plant life of a particular locality or geologic age. The scientific study of plants is called botany. Traditionally, biologists have placed bacteria, fungi, slime molds, and algae in the plant kingdom; today, most biologists place them in other kingdoms.
For Jack and his beanstalk, the sky was the limit, but nature's giants hit a point at which they can't grow any taller. What prevents lofty trees like sequoias from soaring any higher?
If you've heard of frankincense and myrrh, it's probably because you're familiar with the biblical account of Jesus' birth. But have you ever wondered what exactly it was the three wise men gifted Christ?