This is a mixture where substances are difficult to separate.
What is a homologous mixture?
This is an underground source of water.
What is an aquifer?
This is a localized spread of disease.
What is an epidemic?
This is a the part of the atom that determines reactivity and bonds with other atoms.
What are valence electrons?
This is the process by which nutrients are returned to the surface of the ocean.
What is upwelling?
This is the scale that indicates if water is an acid or a base.
What is the pH scale?
This is an atom that has gained or lost a neutron but is the same element.
What is an isotope?
These are the three major macromolecules our cells use and what they break down into.
What are proteins to amino acids, carbohydrates to simple sugars, lipids to fatty acids?