Question

read the text.
for years, fishermen in bali used dynamite and cyanide to catch fish, which had the effect of destroying coral reefs in the area. in 2000, though, the biorock reef restoration project began. under normal conditions, a reef forms when polyps put down layers of calcium carbonate. in the biorock process, a low electric current is sent through steel structures under ocean water, which causes calcium carbonate to form. polyps attached to biorock structures use the energy they would have spent building calcium carbonate and instead devote it to growing and fighting disease. the biorock reefs therefore grow faster than regular reefs.
match causes with their effects.
fishermen used dynamite and cyanide. biorock allows polyps to save energy.
cause effect
coral reefs collapsed.
biorock reefs grow more rapidly.
submit

Explanation:

The text states that using dynamite and cyanide destroyed coral reefs. Also, Biorock allows polyps to save energy (by not spending it on building calcium carbonate) which leads to Biorock reefs growing faster.

Answer:

Cause: Fishermen used dynamite and cyanide. Effect: Coral reefs collapsed.
Cause: Biorock allows polyps to save energy. Effect: Biorock reefs grow more rapidly.