In mammals,histamine is secreted by

Connective tissue is:

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?

Intervertebral disc consists of a shock absorber connective tissue known as

Which of the following vertebrate tissues would be an excellent source of collagen?

Identify the given connective tissues in the figure.