The Textbook Classifies the Elements Essential for Life into Four

question 55

Essay

The textbook classifies the elements essential for life into four categories: the bulk structural elements; the macrominerals; the trace elements; the ultratrace elements.What do these categories mean? Give an example of one element in each category.

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Definitions:

Time

A measurable period during which events occur, processes take place, or conditions exist.

Slope

In mathematics and economics, it's the measure of the steepness or incline, often used to describe a change in a variable in relation to a change in another variable.

45-degree Line

In economics, a reference line that represents where the quantity demanded equals the quantity supplied.

Indeterminate

A state in which something cannot be exactly established, known, or decided.