Bat wings are made of a rubbery substance while eagles wings are covered in feathers
All structures and their functions have cells
Multipolar neurons<span>. This is the </span>most common type of neuron<span>, with one axon and many dendrites.</span>
Its natural selection. Due to genetic variations, some animals have traits more desirable then others. This animals will survive and reproduce better, over time creating a whole new species.
