For each fact pattern below identify potentially applicable employment lawsand state whether the facts suggest if the law was violated and what steps can be taken to avoid such violation

Fact Patterns

1. A 36-year-old fitness coach at a local gym has the most experience of all the staff and works the most hours. She became pregnant. After a few months, she could no longer work the hours required to cover her shifts. She was terminated and replaced with a 20-year-old fitness coach.
2. A 44-year-old male firefighter has been working in his city for ten years. He has been consistently recognized as a high-quality member of the team, and he even won an honor award for saving a woman from a collapsing building. At the staff's annual fall dinner, he brought his partner whom he began dating earlier in the year. The chief called him into his office on Monday following the dinner and terminated him. He did not provide any explanation other than "it was just not working out." The firefighter suspects it was his personal relationship that led to his termination.
3. A 54-year-old female mid-level manager has been working for the bank for 20 years. In prior annual reviews for five years she received above average reviews and a 4% increase in salary each year. Her immediate supervisor has recently been replaced. Now her new supervisor requires her to complete many additional tasks and assume numerous additional responsibilities. Other managers at her same level are not receiving these additional tasks and responsibilities. In her last two annual reviews, her new supervisor gave poor scores. In the last year, she was put on probation. She was terminated yesterday.