What theory about the evolution of humans did the mitochondrial phylogeny study provide evidence for? That Neanderthals genes moved into Africa via gene flow. That our ancestors descend from a population in East Africa that expanded globally relatively recently. That Homo erectus was a human ancestor. That skin color varies due to multiple evolutionary changes during human migration.

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A: Dihybrid cross is a cross between two different lines/genes that differ in two observed traits

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A: Sir Henry Hallett Dale OM GBE  (9 June 1875 – 23 July 1968) was an pharmacologist and physiologist.

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A: Any joint between two blood vessels is known as anastomosis.

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Environmental health and hazards

An organism's environment is the environment in which it lives and has an impact on its well-being. The World Health Organization (WHO) defines environmental health as "those aspects of public health, such as quality of life, that are influenced by physical, chemical, biological, social, and psychosocial components in the environment." Environmental health is concerned with both natural and man-made settings in order to enhance public health. Environmental science, occupational medicine, toxicology, and epidemiology are the key subdisciplines of environmental health.