Matter is conserved, but may change forms or phases.  

This macromolecule contains atoms of carbon, hydrogen, and oxygen and is typically hydrophobic.  

A molecule that contains carbon and is synthesized in living things is called: 

This macromolecule can function in structural support, the immune system, contraction, hormone signaling, and speed up chemical reactions.

Oxygen (O2) can dissolve directly in blood and does not need a special transport mechanism.

In an experiment, variables that are held constant because they may impact the outcome are called – 

Sodium (Na) has an atomic number of 11 and an atomic mass of 22.99.  How many protons does sodium-23 have?

Estudio mucho para __________________ buenas notas. 

Fue dudoso que todos los noticieros  _______ (transmitir) el mismo reportaje.

No puedo hacer nada mientras que (as long as) los estudiantes _______ hablando. (estar)