<span>The answer is letter D. all of the above. A cell may be represented in different models such as an idea model, a physical model and even a computer model. A cell in physical model may be a larger or smaller physical model that picture outs the parts of a cell, while in an idea model, a cell may be given analysis and descriptions and lastly, on a computer model, a cell may look animated or realistic depending on its graphical representation.</span>
-In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly.
-Models are often used to represent things that are very small or very large. Models may also represent things that are very complicated or things that no longer exist. A model can be a kind of hypothesis and can be tested. To build a model of an organism, scientists must gather information learned from fossils and other observations.
The answer that fits the blank provided above is STEROIDS. Steroids are fat-soluble signal molecules. This is one of the derivative compounds of cholesterol along with Vitamin D and bile salts. All steroid hormones are considered as a derivative of cholesterol. The answer for this would be option D.
Answer: The nervous system acts like a highway that transmits information to and from the brain. It communicates what parts of the body might need or not need certain things so that they can be sent to their respective destinations.
