Final answer:
The tests of planktonic foraminiferans sink to the ocean floor and create a calcareous ooze called calcium carbonate ,large stretches of the ocean floor are covered by a type of calcareous ooze called Calcium carbonate.
Step-by-step explanation:
The tests of planktonic foraminiferans eventually sink to the bottom in such high numbers that large stretches of the ocean floor are covered by a type of calcareous ooze called Calcium carbonate.
The tests of planktonic foraminiferans sink to the ocean floor and create a calcareous ooze called calcium carbonate.