an animal being born when temperatures are warm has a positive impact on that animal 's survival & an animal being born when food is available has a positive impact on that animal 's survival ->  an animal being born when food is available and temperatures are warm has a positive impact on that animal's survival  spring has warm temperatures / weather & spring increases the amount of available food in an environment ->  spring has warm temperatures and an increased availability of food in an environment  an animal being born when food is available and temperatures are warm has a positive impact on that animal's survival & spring has warm temperatures and an increased availability of food in an environment -> being born in the spring has a positive impact on an animal's survival