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an informal term for any living species which appears to be the same as a species otherwise only known from fossils and which has no close living relatives. These species have all survived major extinction events. The coelacanth is an example of a living fossil.
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
mass extinction event of 250 million years ago, in which about 90% of all species on Earth died...
small units of DNA that contain hereditary information that is passed from one generation to the...
a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus...
blood that has no antibodies (blood group AB) and can receive any type of blood.