As the arthropod ancestors underwent "arthropodization,"
A)their circulatory system became closed.
B)their hemocoel took on a new function as a hydrostatic skeleton.
C)there was an expansion of surfaces for respiration and excretion.
D)Intersegmental septa became unnecessary.
E)a closed circulatory system became necessary.

Question

Quizplus · Accepted Answer

During arthropodization, the development of a rigid exoskeleton made intersegmental septa unnecessary, as the exoskeleton provided structural support.

As the Arthropod Ancestors Underwent "Arthropodization