Look

Look (species) in a systematics – association of populations of individuals which are capable to crossing with formation of viable prolific posterity, the morpho-physiological signs and types of the relationship with the environment isolated from other same groups of populations of individuals by full not combining ability in nature living in a certain area, having the general complex; main taxonomic (classification) category.

 
Whether you know that:

Scientists from the Oxford university conducted a number of researches during which they came to a conclusion that vegetarianism can be harmful to a human brain as leads to decrease in its weight. Therefore scientists recommend not to exclude completely from the diet fish and meat.