Apparently it is caused by the sex hormones, testosterone, and oestrogen. there. that is the chemical reaction of lust.
the body has levels of organisms that built on each other cells make up tissues, tissues make up organs, and organs make up organs system the function of an organs system
depends on the the integrated activity of it organs for instance digestive system organs corporate to process food
Directional selection acts against b<span>oth extremes simultaneously in the variation of the trait. This is the most "aggressive" form of selection and only happens in extreme areas.
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For the answer to the question above, I believe the answer is the<span> phylogenetic species concept</span>.
The key to the phylogenetic species concept is that species must be "diagnosable." In other words, members of the species should share a combination of characteristics that other species don't have. To look for some unique features that define a phylogenetic species, systematic comparisons must be done by paleontologists with other related fossils or living species
