<span>The spicules have an important purpose for loosely constructed animal such as sponge. First of all, spicules give structure which is vital due to loose construction. Secondly, it protects from predators. This is similar to porcupine quills in serving to protect.</span>
Answer:
a
Explanation:
because I have had this question
Answer:
D
Explanation:
As population grows all the above factors increase expect the biodiversity of animal and plant species.