- Life Sciences
a molecule that is built up of two or more different elements that are chemically joined together in fixed proportions.
the cell organelle responsible for manufacturing and transporting protein and lipids.
middle body tissue layer that forms the muscular, circulatory and excretory systems.
dietary supplements of live bacteria that are good for human health.
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...