What adaptations do periwinkles have?

Answer 1

- it has a light coloured shell to reflect the light from sun so their body keep in the same temperature. - it has a shell to protect their body from being eaten by predators. - it is small in size so its body(shell) can fit in rock platform fissure. - it lives in rock platforms, far from the beach to avoid waves.

Answer 2

A very common shellfish on beaches with brown seaweeds, this is particularly so if bladder wrack dominates and are therefore found the same zone. The shell's size and shape is similar to the bladders on this seaweed and provides better camouflage.

The colour of the shell widely varies, most commonly being brown or yellow, but can be white, green or even banded.

The prevalence of differing colours is dependent on the habitat. The common bright yellow colour seems an unusal defence mechanism. However when yellow shells on seaweed are seen underwater from below, the shell appears to be a similar colour to bladders on the seaweed. This is due to brown seaweed with the light from above shining through it, creating a natural light filter.