Is a structure that contains spores and is located on the underside of fern leaves. basidium bacillus cilium sorus

Sorus is a structure that contains spores and is located on the underside of fern leaves. Sorus is a cluster of sporania. In fungi and lichens, the sorus is surrounded by an external layer. Sorus can be also called a fruit dot. 

In the air and in the lower fre ah water

The hawk receives 0.1% energy from the caterpillar although the caterpillar gets eaten by another bird smaller than the hawk first