THE BIRD'S EGG IS SUCH AN EFFICIENT STRUCTURE FOR PROTECTING THE E...
72. The bird's egg is such an efficient structure for protecting the embryo inside
……….. difficult for the hatchling to break.
a. that is
b. that
c. and is
d. that it is
d
72. The bird's egg is such an efficient structure for protecting the embryo inside
……….. difficult for the hatchling to break.
a. that is
b. that
c. and is
d. that it is
d