Classify the following structures as Digestive, Respiratory and Excretory systems: Skin, small intestine, trachea, stomach, bladder, bronchus. (b) Define a simple machine.

Here are the answers to your questions: 10. (b) (i) How many valence electrons are in the atom? Assumption:* Without information about the specific atom, this question cannot be answered. If referring to a common atom like Carbon, it has 4 valence electrons. If referring to Oxygen, it has 6 valence electrons. Please provide the atom's identity for a specific answer. 10. (b) (ii) What is the valency of the atom? Assumption:* Similar to the above, the valency depends on the specific atom. For example, Carbon has a valency of 4, and Oxygen has a valency of 2. Please provide the atom's identity for a specific answer. 11. (a) Classify the following structures as Digestive, Respiratory and Excretory systems: Skin, small intestine, trachea, stomach, bladder, bronchus. | Digestive system | Respiratory system | Excretory system | | :--------------- | :----------------- | :--------------- | | Small intestine | Trachea | Skin | | Stomach | Bronchus | Bladder | 11. (b) Define a simple machine. A simple machine is a mechanical device that changes the direction or magnitude of a force. It uses a single applied force to do work against a single load force. Examples include levers, pulleys, and inclined planes. Drop the next question 📸