Can someone help me please

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Any sound above what db can cause hearing loss in human beings