Phenomena: something that occurs and is observable

Semipermeable: Only certain very small things can pass through

Membrane: A thin layer of animal or plant tissue

Cytoplasm: A fluid inside a cell inside the membrane that holds up the cell's "insides"

Organism: Any living thing

Aggregate: When many of the same thing are gathered in one spot

Multicellular: To have multiple cells

Carbohydrates: A group of compounds that form sugar

Compound: Multiple atoms linked together

Synthesize: To form something from combineing parts or elements

Carbon Dioxide: a compound containing two carbon atoms that is used by plants and is found in the air.

Photosynthesis: The process in which plants turn light into food

Element: A basic substance that cannot be broken down further

Electron: Part of an atom with an electric charge

Atoms: The basic building block of everything

Stimulus: Something in the environment that causes a reaction in living things.

Life: When something has certain characteristics that allow it to be alive

Domain: The largest level of classification for living things

Kingdom: The second largest of classification for living things

Phylum: The third largest level of classification of living things, contains many more groups.

Class: The fourth largest level of classification of lving things, also contains many more groups the the previous level.

Family: The fifth largest level of classification of living things, this one contains a great number more groups then the previous level.

Genus: The 6th largest level classification of living things. this is part of an organism's name.

Species: The 7th largest level of classification, an aniamls species name goes in their scientific name

Macromolecule: A very large molecule

Molecule: The smallest physical unit of an atom or compound.

Chromosomes: A thread like material that is made up of DNA

Nucleotides: Any chain of molecules that form the basis for DNA

Phosphate: Found in the "side peices" of DNA

Deoxyribose: Also found in the "side peices" of DNA

Purine: What two of the materials used in the "rungs" of DNA are

Pyrimidine: Make up the other two materials used in the "rungs" of DNA

Adenine: Fundamental component of DNA that helps form the "rungs" and links up with thymine.

Thymine: A fundamental component of DNA that helps form the "rungs" and links up with adenine

Guanine: A fundamenetal component of DNA that helps form the "rungs" and links up with cytosine

Cytosine: The fourth fundamental component of DNA that helps form the "rungs" and links with Guanine

Replicate: To create a copy of; reproduce

Producer: An organism that can create its own food from inorganic substances

Tissue: An aggregate of similar cells that form a large mass of cells with a specific purpose in a multicellular organism