Question

how do octopus and squids swim in water as they do not have a streamlined body?

Answer 1

because they have a snake like structure on their bodies like jellyfish and excetra so they will swim in the water without streamlined body

Answer 2

Body of these animals are soft and slimy hence they are referred as mollusca they are aquatic or terrestrial.body of these are triploblastic,eucoelomate,non-segmented.they are bilateral symmetry therefore it can perform 3 type of locomotion's like swimming,creeping &walking.