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The recognition of sexual selection was for a long time in abeyance, but has been rehabilitated. [ 79 ] The conflict between the size of the human foetal brain at birth, (which cannot be larger than about 400 cm 3 , else it will not get through the mother's pelvis ) and the size needed for an adult brain (about 1400 cm 3 ), means the brain of a ...
This theory is based on evidence of megafauna surviving until 40,000 years ago, a full 30,000 years after homo sapiens first landed in Australia, and thus that the two groups coexisted for a long time. Evidence of these animals existing at that time come from fossil records and ocean sediment.
Time immemorial (Latin: Ab immemorabili) is a phrase meaning time extending beyond the reach of memory, record, or tradition, indefinitely ancient, "ancient beyond memory or record". [1] The phrase is used in legally significant contexts as well as in common parlance.
While some evolutionary biologists claim that speciation events have remained relatively constant and gradual over time (known as "Phyletic gradualism" – see diagram), some palaeontologists such as Niles Eldredge and Stephen Jay Gould [87] have argued that species usually remain unchanged over long stretches of time, and that speciation ...
The existential quantifier ∃ is often used in logic to express existence.. Existence is the state of having being or reality in contrast to nonexistence and nonbeing.Existence is often contrasted with essence: the essence of an entity is its essential features or qualities, which can be understood even if one does not know whether the entity exists.
Sustainability is a social goal for people to co-exist on Earth over a long period of time. Definitions of this term are disputed and have varied with literature, context, and time. [2] [1] Sustainability usually has three dimensions (or pillars): environmental, economic, and social. [1] Many definitions emphasize the environmental dimension.
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Time is the continuous progression of our changing existence that occurs in an apparently irreversible succession from the past, through the present, and into the future. [1] [2] [3] It is a component quantity of various measurements used to sequence events, to compare the duration of events (or the intervals between them), and to quantify rates of change of quantities in material reality or ...