Long bones gives us support as well as their bone marrow (the peripheral part) synthesizes (in adults) the blood cells.

Correct Option: B

Long bones gives us support as well as their bone marrow (the peripheral part) synthesizes (in adults) the blood cells.

All mammals have 7 cervical vertebrae in their neck (it is one of the unique mammalian characters). Though they become long in camel & giraffe but the number is 7 only. As whale is also a mammal it also possess the same number of cervical vertebrae.

Correct Option: C

All mammals have 7 cervical vertebrae in their neck (it is one of the unique mammalian characters). Though they become long in camel & giraffe but the number is 7 only. As whale is also a mammal it also possess the same number of cervical vertebrae.

Haversian canals are a characteristic feature of the mammalian bones present in the matrix of bones. They are present in the humerus bone.

Correct Option: A

Haversian canals are a characteristic feature of the mammalian bones present in the matrix of bones. They are present in the humerus bone.

Myasthenia gravis is a chronic autoimmune muscular disease. It causes breakdown of neuromuscular junction due to which the brain loses control over muscles. The symptoms may include drooping eyelids, difficulty in swallowing muscle fatigue, difficult breathing and inability to control facial expressions.

Correct Option: B

Myasthenia gravis is a chronic autoimmune muscular disease. It causes breakdown of neuromuscular junction due to which the brain loses control over muscles. The symptoms may include drooping eyelids, difficulty in swallowing muscle fatigue, difficult breathing and inability to control facial expressions.