Complete analogous pair - Fossils : Creatures : : Mummies : ?

B. HUMAN BEINGS

In the following question, a matrix of certain characters is given. These characters follow a certain trend, row-wise or column-wise. Find out this trend and choose the missing character accordingly.
7 4 5
8 7 6
3 3 ?
29 19 31

C. 5

Complete analogous pair - Aeroplane : Cockpit : : Train : ?

D. ENGINE

Complete analogous pair - Line : Square: : Arc : ?

C. CIRCLE

Complete analogous pair - Dog : Rabis : : Mosquito : ?

C. MALARIA