First of all let me say this,
Plants are among the most quickly evolving life forms on earth, much simular to bacteiral and virus ect... the evoltion of plants occures with every generation of plant, meaning that each new plant goes though the procces of evoltion, this is because only 5% of plant dna is heritary, the other 95% is subject to adation of enviormental conditions, this allows plants of the same species to give fruit at different times in different regions of the world, in some cases it also allows plants to give dubble fruits meaning produce fruit twice a year rather than once a year.
therefore plants are very dependant on eviormental condtions, if plant life is subject to sudden enviormental changes they may not give fruit that year, and many animals that eat the fruit of that plant will then go hungry that year forcing the animals to move to another region, that new region may have other animals that would eat the animal and therefore cause a change in the numder of those animals that eat from that plant. if there is not enough of those animals that eat from that plant then the animals will inbred and become disfunctional, when disfunctional the animal is helpless to preditors and therfore goes exstinct.
As plants are subject to genetics that are controlled 95% by enviroment, the plants may go sterile meaning unable to make fruit or pollen, in such cases the plant just grows and gets bigger, unitll one year, 500 yers later the enviorment warms or new minerals are added to the soil by a river ect... that allows the plant to develope cells that cause it to bear fruit, a example is seeds or roots ect... as long as they are in the dirt or frozen they can come back to life after 1,000s of years, given the PH a tivity of the soil is right. if you read about grafting of plants you will find that a apple tree root or stem will feed nutrients to a plum tree or pear tree, in fact you can grow apples, pears, plums,and cherries on the same tree, the proocess is called grafting.
so then you can see that animals most animals eat from trees, if the trees change due to enviromental condtions that change there genes, the animals have to find some place else to eat or wait untill a different time of the year to eat from that tree, which changes the type of foods the animals eat, this changes the minerals that animals get, when the mineral change in animals, it changes how they reproduce or have babies,called cubs or pups, if they dont have enough mineral the number of pups born that year fall, and there Are fewer animals, which means less and less animals every year, then if they are hunted by preditors or inbreed they will go exstinct.
nothing like good fruit, oranges provide a good source or the mineral vitamin C which helps fight off dieses in humans, such as cancer, scuvy, as well Vitamin C helps the bone and muscels grow behave properly.
DWAYNE D.L.RABON