Which headings best complete the chart?
OX: Flatworms
Y: Segmented worms
X: Segmented worms
Y: Roundworms
O X: Flatworms
Y: Roundworms
X: Roundworms
Y: Flatworms

X: Roundworms

Y: Flatworms

Explanation:

The complexity of bilaterally symmetrical species is determined by the presence of a body cavity called a coelom. From simple acoelamates to complex coelomates, worms are animals capable of living freely, or in parasitic relationships with their hosts. They are often adapted for survival in specific environments.

These each belong  to specific phyla:

answer; atp and nadph;

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.