*Question*
Q: What is the name of the outer layer of skin? Read this paragraph and choose the correct option from the provided answers: The epidermis is the outer layer of skin, consisting of epithelial cells and little else (see Figure below ). For example, there are no nerve endings or blood vessels in the epidermis. The innermost cells of the epidermis are continuously dividing through mitosis to form new cells. The newly formed cells move up through the epidermis toward the skin surface, while producing a tough, fibrous protein called keratin . The cells become filled with keratin and die by the time they reach the surface, where they form a protective, waterproof layer called the stratum corneum . The dead cells are gradually shed from the surface of the skin and replaced by other cells. Choices: - endodermis - hypodermis - the dermis - the epidermis A:
**Answer**
the epidermis

*Question*
Q: What is the ability of a material to return to its original shape after being stretched or compressed? Read this paragraph and choose the correct option from the provided answers: Elasticity is the ability of a material to return to its original shape after being stretched or compressed. Elastic force is the counter force that resists the stretching or compressing of an elastic material. Choices: - acidity - viscosity - solubility - elasticity A:
**Answer**
elasticity

*Question*
Q: Energy from sunlight is absorbed by what pigment in the thylakoid membrane of chloroplasts? Read this paragraph and choose the correct option from the provided answers: Chloroplasts contain stacks of thylakoids , which are flattened sacs of membrane. Energy from sunlight is absorbed by the pigment chlorophyll in the thylakoid membrane. There are two separate parts of a chloroplast: the space inside the chloroplast itself, and the space inside the thylakoids ( Figure below ). Choices: - tannin - keratin - melatonin - chlorophyll A:
**Answer**
chlorophyll

*Question*
Q: What does the respiratory system exchange between the body and the outside air? Read this paragraph and choose the correct option from the provided answers: The job of the respiratory system is the exchange of gases between the body and the outside air. This process, called respiration , actually consists of two parts. In the first part, oxygen in the air is drawn into the body and carbon dioxide is released from the body through the respiratory tract. In the second part, the circulatory system delivers the oxygen to body cells and picks up carbon dioxide from the cells in return. The lungs are organs of the respiratory system. It is in the lungs where oxygen is transferred from the respiratory system to the circulatory system. Choices: - fluids - blood - nutrients - gases A:
**Answer**
gases