Question

what is the name of the fish fins used mostly for balance? select one: a. pelvic b. pectoral c. caudal d. dorsal the crabs feeding on the wastes escaping from the sewer line, makes them select one: a. herbivores b. scavengers c. detritivores

Explanation:

1. For the first question: Pelvic fins primarily function to stabilize and maintain balance in fish, while pectoral fins handle steering, caudal fins provide propulsion, and dorsal fins prevent rolling.
2. For the second question: Scavengers feed on dead organic matter or waste materials, which matches the crabs feeding on sewer waste. Herbivores eat plants, and detritivores consume decomposed organic detritus rather than raw waste.

Answer:

1. a. pelvic
2. b. scavengers