the natural home or environment of an animal, plant, or other organism

Ecology interaction between organisms, populations, or species, in which birth, growth and death depend on gaining a share of a limited environmental resource.

physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, esp. as distinct from energy: the structure and properties of matter.

 is a combination of two or more compounds and can be separated physically. Sand 

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.

a set of elements occupying a column in the periodic table and having broadly similar properties arising from their similar electronic structure.

 a set of elements occupying an entire horizontal row in the periodic table.

a chemical bond that involves sharing a pair of electrons between atoms in a molecule.

sugars used for short-term energy. (glucose being the main one). Monosaccharides are composed of one 

hexagonal sugar molecule (glucose and fructose), disaccharides are made up of two (lactose, sucrose), and polysaccharides are long 

complex sugars (starch, cellulose, chiton).  Sugars are stored as glycogen (in humans- inside the liver) or starch (in plants). Since starch 

(a complex molecule) is too large to pass (diffuse) through the cell membrane, it must be digested first to glucose (a simple molecule) 

before our cells can use it.

fats for long-term energy storage. Blubber, waxes are lipids. Tree leaves outer layer is a lipid to repel water. Lipids make up the 

cell membrane. Lipid molecules can be identified by the the carboxyl group found at the end of a long chain of carbon and hydrogen

made up of amino acids. Have many functions: structural (bones, muscles, tendons), help fight 

diseases (antibodies), transport substances (ex. cell membrane proteins). The function of a protein is based upon its structure and shape 

(which is determined by the DNA code). Change in shape=change in protein. Enzymes are types of proteins that help speed up reactions 

(a catalyst)

all chemical activities in an organism. Enzymes-proteins that control many functions (ex. Digestion of molecules, 

building body structures) Synthesis- making complex molecules. Catalysts speed up reactions (enzymes are a biological catalyst; increase 

in temperature can also be a catalyst for reactions)

barrier of a cell; it’s a lipid bilayer with protein “bridges” that allow 

entry of larger molecules.

 In diffusion, molecules move from high to low concentration. Diffusion occurs 

automatically and requires no energy