Problem: - The hypothalamus in the brain sends a message to the body - Sweat glands in the skin receive the message - The sweat glands start combining water and chemicals to make sweat - The sweat leaves the skin through pores. What might be the first step of the process?

A: The body's temperature increases over 98.6 degrees F

Problem: - The dishwasher heats the water - The detergent dispenser opens at the right time - Water is shot through the jets to clean the dishes - The dirty water is drained - More water is sprayed to rinse the dishes - The water is drained again - The air is heated in the dishwasher to dry the dishes. What might be the first step of the process?

A: Water flows into the dishwasher

Problem: - Air enters bronchioles - Bronchioles have tiny air sacs called alveoli - Alveoli surrounded by small blood vessels - Oxygen absorbed by small blood vessels - Vessels deliver oxygen to every cell in the body - Blood brings carbon dioxide back to lungs - Carbon dioxide released when you exhale. What might be the first step of the process?

A: Air enters the lungs through bronchial tubes

Problem: - The rocky area has a higher elevation than the surrounding areas - Water from precipitation falls in the area - The water forms a stream - The stream flows towards lower elevation - The stream becomes a river - The river continues to flow along the same path for a long time - The river erodes the rocky area that it touches - The eroded area cuts deeply into the rock. What might be the first step of the process?

A:
A large rocky area is formed