Answer:
Isosceles Trapezoid
Explanation:
That fits the definition of a trapezoid nicely, and two congruent sides would mean it's an isosceles.
They can constrict or dilate because their walls are muscular.
Some diseases are lupus, Multiple Sclerosis, <span>Spina bifida.<span>Spinal stenosis. </span></span>
The correct answer is:
C. Four food groups
