What distinguishes blue collar from white collar jobs?
a) blue collar jobs are more physical, white collar jobs are more mental
b)blue collar jobs typically pay less than white collar jobs
c)blue collar jobs tends to have fewer opportunities for career advancement than white collar jobs
d) all of these statements are true

d) all of these statements are true

Explanation:

The blue collar name was created about a century ago, and comes from the fact that manual workers usually wear denim (jean) or blue-colored industrial cotton clothes, because of their resistance.

While office workers usually wear white shirts.

A) Blue collar jobs are more physical,White collar jobs are more mental

TRUE.

B)Blue collar jobs typically pay less than white collar jobs

Typically, TRUE.  But we're seeing a rise in many blue-collar specialties due to lack of employees and because some of the blue-collar jobs have become very specialized,

C)blue collar jobs tends to have fewer opportunities for career advancement than white collar jobs

TRUE.  A plumber for example can only become a senior plumber, he will rarely raise to be the CEO of the plumbing company.  While an accountant or a lawyer have many more opportunities for example.

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.

the answer is d.index