An egg requires warmth to survive.
Inside of the eggs, the embryos grow by shedding their inelastic shell or exoskeleton.
Embryos inside of a shell require warmth to survive.
What inside of a shell requires warmth to survive?
Options:
(A) oysters
(B) abalone
(C) bullfrogs
(D) sand
(E) beads
(F) water
(G) embryos
(H) Echinoids