Помогите пожалуйста образовать в действительном или страдательном залоге.
1. The skin (to compose) of two layers.rs.2. The dermis (to make up) of several layers of cells.3. The thickness of the outer layer (to vary).4. The dermis (to contain) blood vessels and nerves.5. The cells of the epidermis (to require) no supply of blood.6. Melanin (to produce) by special cells in the dermis.7. The presence of melanin (to cause) skin colour.