Mary has to choose between a job and learning French during summer

break. What will be the opportunity cost if she wants to study French?

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having the opportunity to study French

losing the opportunity of a summer job

paying for the French lessons

To develop a molecular clock, you need to find which of the following?

a sequence of molecules

the rate at which changes occur in a type of molecule

how much total change has occurred in a type of molecule from two different species

how many molecules a species has

Step-by-step explanation:

To develop a molecular clock, you need to find which of the following?

a sequence of molecules

the rate at which changes occur in a type of molecule

how much total change has occurred in a type of molecule from two different species

how many molecules a species has

losing the opportunity of a summer job

Step-by-step explanation:

Opportunity cost is the foregone alternative. So she has to forgo the opportunity of a summer job, to have the opportunity to study French. This means that the opportunity of a summer job is the foregone alternative which is the opportunity cost.