Proteins, nucleic acids, carbohydrates and lipids are called macromolecules due to this

The loose connections among molecules gives this substance several properties important in supporting life and stabilizing earth's climate

The gases found here protect and support the organisms in the biosphere

These cycle through the environment endlessly

Carbon, phosphorus and this are the most abundant nutrients in the biosphere

These chains of repeated molecules play key roles as building blocks of life

This stable solution contains equal number of hydrogen ions and hydroxide ions

This is found in the atmosphere and contains oxygen molecules which have three oxygen atoms

Producers use this in addition to the sun's energy or chemical energy to produce carbohydrates

Potassium comes from weathered mineral salt found here

The chemical formula for this substance is C6H12O6

This is the release of water vapor by plants through their leaves

This process includes carbon dioxide and methane which keeps Earth warm

By extracting fossil fuels, humans remove carbon from here

This is the major component of clam shells and corals

This is a complex carbohydrate found in the cell wall of plants

Releasing pollutants into the atmosphere causes this to become more acidic

When plates collide at convergent plate boundaries, one of two events happen. One event consists of lifting material from both plates called mountain-building. This other event is when one plate of crust slides beneath another

The nitrogen cycle relies on these to undergo the right type of chemical change and become useable to organisms

This is a region of water so depleted of oxygen that marine organisms are killed or driven away

These protein molecules serve as chemical messengers within an organism

This allows the transport of materials in plants and animals

While the earth is covered by water, 97.5% of it is salt water. Of the 2.5% of fresh water we have, most of that is made up of this

In this process, the ammonium ions are first converted into nitrite ions then into nitrate ions

Excess nutrients allow an overgrowth of these whose wastes and remains nourish bacteria that deplete oxygen from the waters at the bottom of the Gulf of Mexico