Human cheek cells (seen through a microscope at 400X) The best way to understand cells better is to look at some through a microscope. If you don't have a microscope [...]
What is cytoplasm? A very simple cell (seen through a microscope) What is cytoplasm? Inside all cells, from the most simple to the most complicated, there is cytoplasm. Cytoplasm is [...]
A group of brightly colored sponges in the ocean For almost three billion years, the only living things on earth were one-celled creatures, either prokaryotes or eukaryotes. Even today, the [...]
A flatworm with eye-spots Eyespots came first Living creatures have been able to tell if it's light out or not for about two billion years. That's when some eukaryote cells evolved to [...]
