In one’s personal life many laws must be known and followed, and additional laws, known as ________, apply to a business and its workers, and these too must be known and followed.Multiple Choiceworker lawThere are no such defined laws that apply to businesses.the business constitutionemployment lawde facto business rules

To answer the question, let's analyze each option provided:

1. worker law: This term is not commonly used in legal contexts. It is not a standard term for laws that apply to businesses and their workers.

2. There are no such defined laws that apply to businesses: This statement is incorrect. There are indeed specific laws that apply to businesses and their workers.

3. the business constitution: This term is not a standard legal term. Constitutions generally refer to the fundamental principles or established precedents according to which a state or other organization is governed, not specifically to business laws.

4. employment law: This is a well-known and established term that refers to the body of laws that govern the relationship between employers and employees, including rights and obligations.

5. de facto business rules: This term refers to practices that are followed in reality, even if not officially established by law. It does not specifically refer to the legal framework governing businesses and their workers.

Given the context of the question, the most appropriate term to fill in the blank is "employment law".

So, the complete sentence would be: "In one’s personal life many laws must be known and followed, and additional laws, known as employment law, apply to a business and its workers, and these too must be known and followed."