oxygen and air are abiotic
Voltage-gated sodium channels represent the chemical (or molecular<span>) level of structural organization in muscle sarcolemma.
Chemical level of structural organization is the first and the simplest level within the structural hierarchy. It includes the smallest unit of any of elements-atom, which combine to form molecules and macromolecules which also combine to form organelles, the functioning units of a cell. Sodium channels are membrane proteins which means that they are macromolecules.</span>
<span>Since there's no choices attached on your questions on which of these is not a function of your skin. I'll give you one.
- Holds the bone of the skeletal system is not the function of the skin. Skin only protects.</span>
Answer:
Step-by-step Explanation:
Models are simplified representations of of different complex systems. They also help to study very small or large objects.
Option B, D and E.
Explanation:
Models are very simplified representations of complex systems and organs or structures which are prepared to study those systems by scientists and normal people easily. Many structures of human body like cells or some tissues are very small in structure or microscopic in nature. So studying them are very hard without specific instruments which are not always available. Thus models are made to easily study those structures by scientists and even normal people and students.
