Seaweed in the ocean For the first two billion years of life on Earth, there were only one-celled creatures. But after early eukaryote cells started to reproduce by meiosis in addition to [...]
A beach in Tunisia, in North Africa To find out more about seaweed, take a trip to the coast and go wading in the water. There is seaweed on pretty [...]
Evolution of seeds: Dandelion seeds What is a seed? A seed is the egg cell of a plant, with a hard wrapper around it so it can survive on its [...]
Human sperm cells with flagella (under a microscope) - They're haploid cells. When a cell divides by meiosis, it ends up with only half the amount of DNA it had before. [...]
Black-eyed Susan (the black in the middle is the seeds) - How flowers reproduce When did flowers evolve? The earliest flowers probably developed about 130 million years ago, in the [...]
Sphagnum moss with spores standing up Wander around your back yard or a park until you find a fern. Look at the underside of one of the leaves. There are [...]
Growing seedlings in a pot full of dirt Learn more about seeds by growing your own. Buy a packet of seeds at the store, or save the seed from an [...]
A moss-covered rock During the Cambrian period, about 540 million years ago, some early plants evolved from earlier algae that could live on land, outside of the water. These plants [...]
Moss garden in Virginia For a simple project, go to any place that is often wet, like a pathway on the north side of your house, or the banks of [...]
Ginkgo trees The first trees Ginkgo trees were the first kind of tree. These first trees on earth appeared during the Permian period, about 270 million years ago. This was during [...]
