(I) Coral reefs form gradually as colonies of tiny coral polyps secrete calcium carbonate skeletons over long periods. (II) These skeletal structures accumulate over centuries, eventually forming the large reef systems seen today. (III) Most reef-building corals rely on a symbiotic relationship with algae living within their tissues. (IV) Warmer, shallow waters near the equator generally provide the most favourable conditions for coral growth. (V) Overfishing in some regions has disrupted the balance of species that keep coral reef ecosystems healthy.
Neden?
Paragraf, mercan resiflerinin nasıl oluştuğunu anlatır: poliplerin kalsiyum karbonat iskeleti salgılaması, bunların yüzyıllar içinde birikmesi, alglerle ortak yaşam ve elverişli sular. Aşırı avlanmanın ekosistem dengesini bozduğunu söyleyen cümle ise insan kaynaklı bir tehdide geçerek oluşum konusundan kopar.
PARALLEL BASE · Q717