A simple stain is (one dye) used to show that bacteria are present and what they look like as opposed to other matter and the background. A differential stain (uses two dyes) is used to seperate organisms into groups.
A simple stain is used to show that bacteria is present and what they look like opposed to other matter. a differential stain is used to separate organisms into groups.
The circumference is the distance of the earth that is measured around the poles. Eratosthenes method of finding the circumference of a planet with the sun's rays cast a shadow on the equator a vertical stick of 2,500 km making an angle of 40° with the planet shows a distance of 40,075.017 km.
He also estimates that the meridian has a length of 252, 000 stadia. And described these techniques in his book measure of the earth.
