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Large reptiles were beginning to be replaced by mammals as the dominant large land animals.
Among the mammals, there were a few archaic egg-layers (monotremes) like the ancestors of the platypus and echidna.
adaptation: Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment.
La vallée de Makapan, elle aussi sur ce site, abrite dans ses nombreuses grottes archéologiques des traces d’occupation et d’évolution humaines remontant à quelque 3,3 millions d’années.
L’ensemble de la région contient des éléments essentiels définissant l’origine et l’évolution de l’humanité.
methods rely on characteristic faunal and geological patterns to bracket the period when the fossil existed.
acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large muscles of a weightlifter).
Widgets Human evolution from an ancestral primate species is not a vague hypothesis, but a historical fact.
Archaeological geology as a science had to precede the proposal of evolution, as an understanding of the immense age of the earth is necessary to understand evolution.
If such a behavior is even partly genetically determined, it will tend to become widespread in the population.
Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.
adaptive landscape: A graph of the average fitness of a population in relation to the frequencies of genotypes in it.Tags: Adult Dating, affair dating, sex dating