Which of the following produces a chemical change?

A. Liquid wax hardens into the shape of a candle

B. A piece of iron is ground into iron powder

C. Ice melts to form water

D. Paper burns to form carbon dioxide and water

Why is cell division important

Explain the role of the mechanisms responsible for regulating sodium and water intake in regulating blood pressure. be specific about the hormones and enzymes involved and the effects of these enzymes and hormones on blood pressure.

What is the process called for heating liquids to prevent spoiling by bacteria and other microorganisms?

What happens to the energy during a chemical reaction? Energy is burned up by the reaction. Energy is converted from one form to another. Energy is created by the reaction. Energy is used up by the chemical reaction.

The ostrich egg is enough big so why the cell organelles are big of its egg (cell)

What it a dilute solution

Is Chitin a Carbohydrate or a Protein?

You want to compare the evolutionary relationships between four species of birds, which of the following would be most useful? Question 1 options: A) nesting behaviors B) DNA sequences C) color of feathers D) patterns of migration

Two hypotheses about how life supporting molecules appeared on earth

Dna strands serve as which of the following during dna synthesis