Pick from: I. oysters II. abalone III. bullfrogs IV. sand V. beads VI. water VII. embryos VIII. Echinoids
Q: You are presented with the quiz "What inside of a shell requires warmth to survive?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an egg requires warmth to survive" and "inside of the eggs, the embryos grow by shedding their inelastic shell or exoskeleton". So, what's the best answer to the question?
A:
VII.