Which of the following is the transverse canal found in the long bones of mammals?

Mast cells secrete which of the following?

$A$ ligament is a -

Which of the following types of connective tissue is mismatched with its matrix?

Which structure is helpful in maintaining body temperature?

Read the following statements and answer the question.
$(i)$ They have a hard and non-pliable ground substance rich in calcium salts and collagen fibres.
$(ii)$ They support and protect softer tissues and organs.
$(iii)$ Osteocytes are present in the spaces called lacunae.
$(iv)$ They also interact with skeletal muscles attached to them to bring about movements.
Which of the following type of tissue is being described by above statements?