Answer:
(1) they keep toxic substances out of the cell; (2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the cell and the outside environment
Explanation:
The <span>outer layer of the skin that makes the body waterproof, gives it color, and helps to maintain hydration levels is the melanin. This is the reason why we have different colors of skin. The rest of the choices do not answer the question above.
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The correct answer is option A. which states that the two functions of carbohydrates in plants are structural support and energy storage.
- Cellulose is a polysaccharide which is made up of numerous glucose chains linked to each other.
- It's main function is to provide a structural rigidity and support to the plants. It is also a constituent of the cell wall.
- Starch is another polysaccharide which is serves as the primary source of food and energy for living beings.
- Plants produce sugar through the process of photosynthesis using sunlight, carbon dioxide and water which is stored in the form of starch in plants.
Hence, the correct answer is option A. the two functions of carbohydrates in plants are structural support and energy storage.
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Answer: Active transport
Explanation: requires the cell to spend energy, usually in the form of ATP. Examples include the transport of large molecules (non-lipid soluble) and the sodium-potassium pump. Types of active transport.