The echinoderms are a phylum of invertebrate animals that includes starfish, sea urchins, and sand dollars. One feature that distinguishes echinoderms from other groups of organisms is their system of locomotion——the bottoms of echinoderms are covered with a number of tiny tube feet, which aid the echinoderm in feeding and slow movement on the ocean floor.
[Study with Quizlet and memorize flashcards containing terms like Below are descriptions of silicates and nonsilicates. Choose all those that represent nonsilicates., Match the different forms of calcite with their description., Banded iron formations are made of the minerals ______ and ______. and more.
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[Volume 7, pages 83-86, 1922. NOTES ON SAND CALCITE FROM SOUTH DAKOTA. HAROLD R. WANLESS, Princeton University It was the writer's privilege last summer to visit the Rattlesnake Butte locality in South Dakota where great quantities of sand calcite crystals may be obtained, and, as this locality would doubtless be very interesting to mineralogists who might
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