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In evolutionary psychology and behavioral ecology, human mating strategies are a set of behaviors used by individuals to select, attract, and retain mates. Mating strategies overlap with reproductive strategies, which encompass a broader set of behaviors involving the timing of reproduction and the trade-off between quantity and quality of ...
In placental mammals, the sperm cells exit from the urethra through the penis for males while the egg cells exit through the oviduct to the uterus for females. Other vertebrates of both sexes possess a cloaca for the release of sperm or egg cells. Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals ...
Human bonding is the process of development of a close interpersonal relationship between two or more people. It most commonly takes place between family members or friends, [ 1] but can also develop among groups, such as sporting teams and whenever people spend time together. Bonding is a mutual, interactive process, and is different from ...
Ignorance Really Is Bliss. The human body is a beast of a machine. The heart is a timeless masterpiece. The brain literally named itself. All of that being said, tread lightly through this list of ...
Lactase persistence or lactose tolerance is the continued activity of the lactase enzyme in adulthood, allowing the digestion of lactose in milk. In most mammals, the activity of the enzyme is dramatically reduced after weaning. [ 1] In some human populations though, lactase persistence has recently evolved [ 2] as an adaptation to the ...
In animals, including humans, the startle response is a largely unconscious defensive response to sudden or threatening stimuli, such as sudden noise or sharp movement, and is associated with negative affect. [ 1] Usually the onset of the startle response is a startle reflex reaction. The startle reflex is a brainstem reflectory reaction ...
Number 9. Stepping on a stonefish. The sea creatures are one of the most poisonous fish. They also really hate it when people step on them. When that happens, the fish immediately release venom ...
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period . It includes brief explanations of the various taxonomic ranks in ...