what evidence is there to show that changing sand to glass is a chemical change

What hormone causes breast development and production of milk?

Why does increased global movement of people increase the risk for pandemic flu? A. It decreases the population densities of urban areas. B. It increases the transmission of flu between countries. C.

Which of the following statements about deuterostomes is false? All deuterostomes have a coelom. All deuterostomes are triploblastic and have three tissue layers. All deuterostomes have a similar pattern of early embryonic development.

Why do you Sandy beaches form at many sea shores

Which sequence shows the order of energy flow in a food chain? Urgent 1. sun - rabbit - -grass - owl 2. grass, rabbit, owl, sun 3. sun, grass, rabbit, owl 4. owl, rabbit, grass, sun

How do electrons gain energy in photosystem 1? a. They absorb photons. b. They use energy in the form of glucose. c. They take energy from ATP molecules. d. They use energy from a hydrogen ion pump.

Is hydrogen gas a compound or mixture

Nutrients can be classified as essential or non-essential. all of the following are reasons why a nutrient could be considered an essential nutrient except

What is normal heart rate for an adult that is sitting quietly?

What are two reactants needed for cellular respiration?