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Answer:
They are the most common type of joint.
Explanation:
Synovial joints are the most common type of joint found in the human body that move against each other. Synovial joints are also known as Diarthroses (freely movable) and it's examples are knee and shoulder.
Synovial joints are the most common type of joint because they are generally found in most of the joints such as ball and socket joint, condyloid joint, hin.ge joint, gliding joint, saddle joint and pivot joint. So, it is almost present in every joint of human beauty.
Hence, the correct answer is "They are the most common type of joint."
The correct answer is B.
Air pollution can cause cardiovascular diseases as the pollutants in the air can damage your heart and lungs. This isn't always the case but if you live in a highly polluted area you are running the risk of developing a cardiovascular disease as well as other diseases related to the inhalation and exposure of toxins and chemicals in the air.