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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.
During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
![(a) Mean duration (days) and (b) average maximum depth (mm) of snow cover throughout northern latitu](https://biology-forums.com/gallery/47/medium_33_08_09_11_10_42_11_1675758.jpeg)
![On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_11_47_16972494.jpeg)