What is a tissue?

$A$ lion and a mango tree are both complex living organisms with specialised yet different tissue systems to perform basic life processes. Give two reasons for possessing different tissues to perform similar functions.

What is the utility of tissues in multicellular organisms?

$(a)$ Why are complex tissues called so?
$(b)$ Why is connective tissue called so?
$(c)$ What is the function of the tissue present in the lining of kidney tubules?

Name the following:
$(a)$ Tissue that forms the inner lining of our mouth.
$(b)$ Tissue that connects muscle to bone in humans.
$(c)$ Tissue that transports food in plants.
$(d)$ Tissue that stores fat in our body.
$(e)$ Connective tissue with a fluid matrix.
$(f)$ Tissue present in the brain.

Name the following tissues:
$(a)$ The connective tissue found between the skin and muscles.
$(b)$ The tissue which connects two bones.
$(c)$ The epithelial tissue which forms the lining of the kidney tubules.
$(d)$ The tissue which is present in the veins of leaves.