All heterotrophs are consumers. How would you classify them?

Why are heterotrophs called consumers ?

How can you classify foods?

How would you classify business activites?

An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristis do you expect the element to possess?

You are given leech, Nereis, Scolopendra, prawn and scorpion, and all have segmented body organisation. Will you classify them in one group? If no, give the important characters based on which you will separate these organisms into different groups.

Rate of increase in biomass by heterotrophs or consumers per unit time and area is known as :

Assuming that half the population are consumers of chocolate,so that the chance of an individual being a consumer is 1/2, and assuming that 100 investigators each take ten individuals to see whether they are consumers, how many investigators would you expect to report that 3 people or less were consumers?