Chemosynthetic bacteria
Symbiotic
bacteria
Which organisms are both secondary and tertiary consumers in this food web?
A Chemosynthetic bacteria and amphipods
B Zooplankton and mussels
C Ratfish and octopuses
D Galatheid crabs and zoarcid fish
D
B
O

C. Ratfish and octopuses

Explanation:

Ratfish and octopuses are the organisms which are considered as secondary and tertiary consumers in this food web because Ratfish is a secondary consumer that feeds on primary consumer while on the other hand, octopuses is considered a tertiary consumer that feeds on secondary consumers so that's why both  organisms which are considered as secondary and tertiary consumers in this food web.