[Campbell Biology P.764] According to the text, what is a primary characteristic of sea urch... | Practice Question

According to the text, what is a primary characteristic of sea urchins that aids in both locomotion and protection?

  • A: Long, flexible arms.
  • B: A stalk for attachment to the substrate.
  • C: Long spines.
  • D: Absence of tube feet.

Explanation

The text explicitly states for Echinoidea that 'Sea urchins also have muscles that pivot their long spines, which aid in locomotion as well as protection Figure 33.46 '.