calcium
limestone is made underwater from the shells of animals. We know this because limestone also contains many fossils.
limestone is made underwater from the shells of animals. We know this because limestone also contains many fossils.
Toxicity
No. Limestone is usually formed from the shells of marine animals or calcite precipitates from seawater.
It was the skeletons/shells of living animals and plants.
They give you spectacular eye sight.
gastrointestinal tract
Plants can synthesize organic compounds from inorganic compounds like CO2 & H2O. Animals depend for their biological energy on organic compounds prepared by plants.
coral reef
Reef Limestone
Coral reef.
Gastrointestinal Tract.