There are many different problems that can create in animal life. :)
UV rays affect the animal life. They can cause various problems in them.
Saturated fat.
it creates pollution when being made
Coral is an animal that creates a shell.
Me.
life
The animal will be hurt and will have MAJOR problems, possibly even death.
sometimes things u see as problems aren't really problems, and sometimes those 'problems' are best left unsolved.
tropical regions
I would evolve man to a point beyond the problems he creates himself, they can do the rest.
It creates tides
Plant and animal life that are not of the same species can mate. In plant life, this creates hybrid strains of plants, such as varieties of corn. In animal life, creatures such as the Liger exist. The Liger is a result of a lion and tiger mating and producing an offspring. A horse and a donkey mate to create a mule.