The surface area of contact between the epidermis and the dermis is increased by structures called . This increased surface area allows for improved gas and nutrient exchange and waste removal by dermal blood vessels.

The correct answer is: Stratum basale or Stratum germinativum.

Explanation:

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.