*Question*
Q: Puberty and other physical changes occurs during which stage of development? Read this paragraph and choose the correct option from the provided answers: Adolescence includes the physical changes of puberty among other changes. Choices: - childhood - infancy - adulthood - adolescence A:
**Answer**
adolescence

*Question*
Q: Many species secrete a hard external skeleton of what? Read this paragraph and choose the correct option from the provided answers: Choices: - sodium bicarbonate - hydrogen carbonate - carbon dioxide - calcium carbonate A:
**Answer**
calcium carbonate

*Question*
Q: How do dogs lose body heat? Read this paragraph and choose the correct option from the provided answers: One way mammals lose excess heat is by increasing blood flow to the skin. This warms the skin so heat can be given off to the environment. That's why you may get flushed, or red in the face, when you exercise on a hot day. You are likely to sweat as well. Sweating also reduces body heat. Sweat wets the skin, and when it evaporates, it cools the body. Evaporation uses energy, and the energy comes from body heat. Animals with fur, such as dogs, use panting instead of sweating to lose body heat (see Figure below ). Evaporation of water from the tongue and other moist surfaces of the mouth and throat uses heat and helps cool the body. Choices: - barking - sweating - eating - panting A:
**Answer**
panting

*Question*
Q: What is the protein that carries iron that binds with oxygen in red blood cells? Read this paragraph and choose the correct option from the provided answers: The trillions of red blood cells in blood plasma carry oxygen. Red blood cells contain hemoglobin , a protein with iron that binds with oxygen. Red blood cells are made in the marrow of long bones, rib bones, the skull, and the vertebrae. These cells survive for about 120 days, and then they are destroyed. Mature red blood cells lack a nucleus and other organelles, allowing for more hemoglobin, and therefore more oxygen to be carried by each cell. Choices: - keratin - potassium - insulin - hemoglobin A:
**Answer**
hemoglobin