The tissue whose cells are thin-walled and living, more or less isodiametric and have intercellular spaces is known as

Read the following four statements $\left(i\right)-\left(iv\right)$ having certain mistakes in two of them.

$\left(i\right)$ Adipose tissue is a type of dense connective tissue located beneath the skin.
$\left(ii\right)$ The compound epithelium has an extensive role in absorption and secretion.
$\left(iii\right)$ Most of the cartilages in vertebrate embryos are replaced by bones in adults.
$\left(iv\right)$ Smooth muscles are 'involuntary' as their functioning cannot be directly controlled.

Which of the above statements have mistakes?