Search results
Results from the WOW.Com Content Network
In the History of Animals, Aristotle sets out to investigate the existing facts (Greek "hoti", what), prior to establishing their causes (Greek "dioti", why). [1] [3] The book is thus a defence of his method of investigating zoology. Aristotle investigates four types of differences between animals: differences in particular body parts (Books I ...
[2] [3] Estimates on the number of Earth's current species range from 10 million to 14 million, [4] with about 1.2 million or 14% documented, the rest not yet described. [5] However, a 2016 report estimates an additional 1 trillion microbial species, with only 0.001% described. [6]
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
Since their first use in the mid-1980s, microchips have allowed innovative investigations into numerous biological traits of animals. [2] The tiny, coded markers implanted into individual animals allow assessment of growth rates, movement patterns, and survival patterns for many species in a manner more reliable than traditional approaches of externally marking animals for identification. [2]
2.5-2.2 Ga First organisms to use oxygen. By 2400 Ma, in what is referred to as the Great Oxidation Event , (GOE), most of the pre-oxygen anaerobic forms of life were wiped out by the oxygen producers.
The bits of a double bridle, showing both a type of snaffle bit called a bradoon and a curb bit. A bit consists of two basic components, the bit mouthpiece that goes inside the horse's mouth, and the bit rings of a snaffle bit or shanks of a curb bit, to which the bridle and reins attach.
If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online!
[2] [3] The earliest artistic evidence of use of some form of bitless bridle was found in illustrations of Synian horsemen, dated approximately 1400 BC. [4] However, domestication of the horse occurred between 4500 and 3500 BC, [5] while earliest evidence of the use of bits, located in two sites of the Botai culture, dates to about 3500–3000 BC.