What is the name of structure 'X' and what pigment is found inside? A)
chlorophyll and the pigment is chloroplast
B)
stroma and the pigment is chlorophyll
C)
guard cells and the pigment is xylem
D)
thylakoid and the pigment is chlorophyll
DLL

Ithink that b is correct but just in case wait to see if someone else answers

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.

Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.