Question

1. what stretch is used to strengthen and help keep the back safe from injury?

biceps curl
pelvic tilt
sit - up
push - up

1. what happens to back ligaments when a person frequently slouches with poor posture?

they stretch and lengthen.
they contract and shorten.
there is no ligament effect.
they get strong and healthy.
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Explanation:

For question 4, the pelvic tilt is a common exercise to strengthen the core and support the back. Biceps curl works the arms, sit - up mainly targets the abdominal muscles (though it can have some back involvement but not as a stretch for back safety), and push - up is for the chest, shoulders, and triceps.
For question 5, when a person slouches (poor posture), the back ligaments are in a position where they are stretched and lengthened over time. Contracting and shortening would be more related to active muscle contraction (not the case in slouching). Saying there is no effect is incorrect as posture affects ligaments, and getting strong and healthy is not the result of poor posture (it can lead to weakening and potential injury over time).

Answer:

1. Pelvic tilt
2. They stretch and lengthen.