Question

which is true concerning muscle tissue?
cuboidal shape enhances function
contains contractile units made of collagen
is a single - celled tissue
highly cellular and well vascularized

Explanation:

Muscle tissue is highly cellular, meaning it has a large number of cells. It is also well - vascularized, having a rich blood supply. Cuboidal shape is not a characteristic of muscle tissue (cuboidal cells are more common in epithelial tissues). Contractile units in muscle are made of actin and myosin, not collagen. Muscle tissue is multi - cellular, not single - celled.

Answer:

highly cellular and well vascularized