Question

The tentacles of a squid are appendages that have been modified from which primitive molluscan structure?

Answer 1

The correct answer is foot.

Mollusks have more diverse forms in comparison to any other animal phylum. They comprise, the slugs, snails, and other gastropods; squids and other cephalopods; clams and other bivalves; and other lesser known but identically different subgroups.  

The cephalopods like octopuses and squids possess the head, which is prominent and the foot that has been amended into tentacles. The cephalopods have an absent or diminished shell and exhibit the most advanced nervous system of the invertebrates.  

Answer 2

The tentacles of a squid are appendages that have been modified from foot.

Further Explanation:

Molluscs are invertebrates and they are the second-largest phylum, the largest phylum is arthropods. Molluscans have around 84,000 species. There are many species which live in freshwater and terrestrial habitats.

Molluscs have many different classes such as,

• Gastropods

• Cephalopods

• Bivalvia

• Aplacophora

• Scaphopoda

• Polyplacophora

• Monoplacophora

Squid are a type of Cephalopods; they have two tentacles, 8 arms, large eyes, and elongated body

The symmetry of squid’s body is bilateral. They are externally soft and internal skeleton is hard made up of chitin. Squid use bioluminescent activity to distract the predator. They use tentacles to grab food and arms are used to hold the food.

Some other examples of Cephalopods are Octopus and Nautilus.

The pair of tentacles is modified from primitive molluscan foot; they can reach to a length of 8 meters in 15 milliseconds. They are part of the locomotory system of squid.

Learn More-

1. Learn more about animal: brainly.com/question/10208427

2. Learn more about classification system: brainly.com/question/1468204

3. Learn more about kingdom classification: brainly.com/question/4408449

Answer Details-

Grade: High School

Subject: Biology

Chapter: Ecology

Keywords:

Gastropods, Cephalopods, Bivalvia, Aplacophora, Scaphopoda, Polyplacophora, species, phylum, tentacles, primitive, mollusca, locomotary system, appendages, habitat, octopus, nautilus, bioluminescent, food, elongated, body, arms, eyes.