The first trees showed up about 385 million
years ago during a time called the Devonian
Period. Four-legged amphibians were walking
around in the forests, probably eating insects.
The world was warmer then. The earliest trees had
leaves like ferns. They reproduced using spores.
Seeds evolved later. Some early trees developed
cones around the seeds. Their pollen travelled on
Trees that produce flowers didn’t show up until
much later, about 200 million years ago.
Ginkgo trees have been around for about 100
million years ago and still look about the same as
they did then.
Trees had an advantage over their shorter
ancestors. They could get the sunlight before
their short neighbors. Their spores would fall
farther away, so they wouldn’t compete with the
Grass is a latecomer. It didn’t show up until
about 40 million years ago, but it was very
successful. What are some traits that might
have helped grasses survive and spread?
You may want to study plant ecology and evolution.
Thanks for asking.