What is the difference between a rock and a mineral? A rock is composed of combinations of minerals, each mineral having its own chemical formula and crystalline structure. Minerals are composed of an element or combination of eâ¦lements. Granite, for instance, is an intrusive igneous rock composed of the minerals quartz, feldspar, mica, hornblende, and other combinations or ratios of minerals.
Colloblasts are a cell type found in ctenophores. They are widespread in the tentacles of these animals and are used to capture prey. Colloblasts consist of a coiled spiral filament that is embedded in the epidermis and an axial filament with a granular dome.The apical surface of these cells consist of eosinophilic granules that are thought to be the source of adhesion.On contact, these granules rupture, and release an adhesive substance onto the prey. The spiral filament absorbs the impact of the rupture, preventing the ensnared prey from escaping.he apical surface of these cells consist of eosinophilic granules that are thought to be the source of adhesion. On contact, these granules rupture, and release an adhesive substance onto the prey. The spiral filament absorbs the impact of the rupture, preventing the ensnared prey from escaping.
An oncologist is a doctor who is qualified in the treatment of cancer. He must be fully trained in the various types of cancer and the best treatment for each. He may also specialize in and treat only a specific type of cancer. An oncologist is trained to know exactly what to look for regarding the symptoms of cancer.