Which is the correct option for labels a, b and c in the given diagram ?

Which option is correct for the region labelled as a, b, c and d in the given diagram? Options:

Recognise a,b and c in the diagram

Identify the fossils a, b and c in the given diagrams:

Which option is correct for the region labelled as "a" and "b" in the given diagram?

Which option is correct for the region labelled as "a" and "b" in the given diagram of transverse section of gut?

While urine formation process, which of the following process takes place in the region labelled as 'a', 'b', 'c' and 'd' in the given diagram ?

Identify a and b in given diagram .

Recognise the a,b and c in the diagram

Choose the correct terms for labelled parts in the given figure.