It is ribosome just because the other ones are not proteins their cells ribosomes are produced from the endoplasmic reticulum
<span>The question is, 'siltstone is made mostly of ..........Siltstone is made from silt, also known as clay. It's grains are very fine. Deposition of silt usually become compacted and cemented together over a long period of time resulting in solid stone. Over a long period of time the solid stone eventually develop into a sedimentary rock.</span><span />