Cells are the smallest unit of life. Cells in multicellular plants and animals are arranged into tissues, organs and organ systems. Cells. Tissues. Organs. Organ systems. And the organism itself.

FEW attempts have been made to maintain (or grow) animal tissue cells in protein-free media, although it has been shown 1 that the low molecular weight substances of blood plasma are of the utmost ...

The revelation shows that animals buried in ash-rich volcanic substances can have their soft tissues preserved, the first ...