In living cells, chemical processes, such as synthesis, all require the action of 1. specialized antibiotics 2. hormones 3. salts 4. biological catalysts

The correct answer is:

BIOLOGICAL CATALYSTS.

In living cells chemical processes such as synthesis all require the action of biological catalysts. Biological catalysts are enzymes that speed up the chemical processes in the body.

Explanation:

Enzymes are water-soluble protein molecules that can promote up chemical reactions in cells. These reactions constitute respiration, photosynthesis and manufacturing new proteins. For this purpose, enzymes are seldom called biological catalysts. In fact, the human body would not survive outwardly enzymes because the chemical reactions needed to sustain the body simply would not occur fast enough.

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igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this