The answer should be D because the skin. Has layers correct but there really thick and it makes bacteria and infections hard to pass through but at the same time we have already dead skin cells on us that either block out or destroy others layers that can’t infect the skin
Yes as a compound machine is a machine that consists of more than one simple machine. Some compound machines consist of just two simple machines. For example, a wheelbarrow consists of a lever, as you read earlier in the lesson "Simple Machines," and also a wheel and axle. Because a sprinkler has a rotation component and a transportation of water with the hose.
A rock, a car, something nonliving.
Leprosy is a good example of a ring-like skin lesion
