Katrina drew a diagram to compare roundworms and flatworms. Which label belongs in the area marked Y?
A.) Reproduce sexually
B.) Are usually very small
C.) Can grow to twelve meters
D.) Are always parasitic​

I think is D

Explanation:

Most flatworms are parasites that obtain their food from a host animal. A parasite

lives inside or on another living organism. Sometimes a parasite will kill its host,

but usually the host survives. Flatworms' bodies are flat and as soft as jelly. Some

common ones are planarians, flukes, and tapeworms.

D on edge

Explanation:

Are always parasitic​

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.