Setae fix the body to substratum what is the meaning of substratum here
Solution
Substratum is an underlying layer or substance. In particular a layer of rock or soil beneath the surface of ground. Setae are stiff structures in invertebrates and they help in attaching body to Substratum.
Substratum is an underlying layer or substance. In particular a layer of rock or soil beneath the surface of ground. Setae are stiff structures in invertebrates and they help in attaching body to Substratum.