Question

What kinds of traits are: tentacles in octopi & squids, and dorsal fins in orca & sailfish?

analogous, homologous
		homologous, analogous
		both are analogous
		both are homologous

Answer 1

ANSWER :- b.) Homologous and analogous.

Tentacles in octopi and squids are homologous. The tentacles are homologous trait. The octopus and squid are two different species in which posses the similar trait of having tentacles. Tentacles of the octopus differ than those of squid. Octopus have 8 tentacles and squid have 10 arms in total, but only two of those are actual tentacles. The general common ancestor for the octopus and squid were cephalopods. These traits are eventually adapted with the process of evolution.

Dorsal fins of orca and sailfish are analogous. A Doral fins is a fun located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. The dorsal fins are particularly closely related to each other, though convergent evoy they have independently evolved external superficial fish-like body plans. The function of dorsal fins of both orca and sailfish is to cooling and heating system of fish. In both the dorsal fins is help them to stabilize the fish against rolling and to assist bin sudden turns. They do not have common ancestor but their dorsal fins perform the common functions.