Answer:
The endocrine system is a collection of specialised organs (endocrine glands) scattered throughout the body that act to produce hormones.
Explanation:
Due to the need to have completely controlled experiments to test a hypothesis, science can not prove everything. For example, the scientific method cannot alone say that global warming is bad or harmful to the world, as it can only study the objective causes and consequences.
The answer is skeletal muscle all skeletal muscles are attached to some component of the skeleton, unlike smooth muscle which comprises hollow organs such as the intestines or blood vessels.
