The firsy one does both oxygenated and deoxygenated blood use the umbilical artery
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A biological species is a group of organisms that can reproduce with one another in nature and produce fertile offspring. ... The term species can also be defined as the most basic category in the system of taxonomy.
binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts
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body's water needs, conserving water if the body is dehydrated or making urine more dilute to expel excess water when necessary. ADH is a hormone that helps the body to retain water by increasing water reabsorption by the kidneys.
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Economics - is the social science that describes the factors that determine the production, distribution and consumption of goods and services
