Examlex
Which of the following is sometimes referred to as an incomplete digestive tract,with only one opening?
Silica Tetrahedron
A structural unit of silicon ion surrounded by four oxygen ions, forming the basic building block of silicate minerals.
Silicon
The fourteenth element in the Periodic Table, having the atomic symbol Si.
Silica Tetrahedra
The basic structural unit of silicate minerals, consisting of four oxygen atoms surrounding a single silicon atom.
Silicate Minerals
A group of minerals that contain silicon and oxygen, usually with other metals, forming the largest and most important class of minerals on Earth.
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