Radiata contain two germ layers including the ectoderm and the endoderm, other Eumetazoa differ in that they have an additional layer called the mesoderm.
The mesosphere is an atmospheric layer, which can also be considered a collection of layers. The mesosphere lies above the stratosphere but below the thermosphere, the other two "middle" layers of the atmosphere.
Because there different kind of layers and they each are totally different from each other!
Coelmata, three tissue layers, and in the larval state they posses a notochord.
In ancient times, it was believed that there were seven heavens, one above the other. God sat in the highest heaven, while various angels and spirits inhabited each of the lower heavens. Rather than based on atmospheric layers, it was really based on the motions of the sun, moon, planets and stars, since each was believed to occupy a different level in the heavens.
how does it different from the families of other societies
how do animal differ from onr other
because if your name is Teddy then your a ninja and don't have to answer that question
They have a different number of neutrons.
their wavelenghts are different
The number of protons is different.
Compared to the other layers, the mantle is the largest and thickest. But it's also one of the Earth's four main layers as a similarity.