Offsprings, natural selection, a measure of reproductive success.
Explanation:
Pattern of life history in individual or population evolve by Natural selection, Life history pattern optimizes the trade offs as energy spend in raising the offspring.
The energy resources in the earth is limited and organisms had to fight for the resources for growth, multiplication and survival.
The offspring with the traits will use the effective way to use the resources than with the siblings who lack the trait,
The reproductive success is ultimately a measure of natural selection.
The answer to your question is,
if the oxygen poor blood mixes back with oxygen rich blood, that means that oxygen poor blood is not going back to the lungs to swap CO2 (carbon dioxide) with O2 (oxygen), and this swapping is vital to tissue survival, since oxygen is what keeps your tissues, muscles, and organs alive. so if this blood mixed, ultimately your organs are not receiving enough oxygen and will become starved of it, this can kill you and lots of people every year get heart surgery because their atrium or ventricles in their heart rupture
-Mabel <3
The population would decrease. Since Hawks eat snakes, there would be an abundant amount of snakes meaning more snakes to eat the frogs.
Not hot enough for a life giving atmosphere