Final answer:
A fertilizer is any material that provides plant nutrients essential to the growth of plants. Magnesium is needed by chlorophyll, manure is animal waste used as fertilizer, minerals and water are taken in by plant roots, legumes make nitrogen fertilizer, and synthetic fertilizer is made of manufactured chemicals.
Step-by-step explanation:
A fertilizer is any material (of natural or synthetic origin) that is applied to soil or to plant tissues that provides one or more plant nutrients essential to the growth of plants. Nitrogen, phosphorus, and potassium are the main macronutrients and calcium, magnesium, and sulfur are the secondary macronutrients in fertilizers.
In this question, the items that match are:
- magnesium - needed by chlorophyll
- manure - animal waste; fertilizer
- minerals and water - taken in by plant roots
- legumes - plants which make nitrogen fertilizer
- synthetic fertilizer - manufactured chemicals