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photosynthesis

the process by which plants use the energy from sunlight to produce sugar

phenotype

a physical characteristic

pesticides

chemicals used to kill organisms viewed as pests

pedigree

family trees showing the occurrence of traits in parents and offspring across multiple generations

parasitism

one organism benefits at the expense of the other (the host)

paleontology

a study of the history and development of life on Earth as based on the fossil record

organelles

very tiny structures that exist within a cell that allow the cell to function

nucleotide

the combination of a sugar, a phosphate molecule, and a nitrogenous base

nucleus

a large structure inside a cell that contains the genetic material (DNA and RNA) and controls the cells activities

osmosis

the movement of water molecules across a selectively permeable membrane

Pangaea

the hypothetical supercontinent that existed when all Earth's landmasses were joined before the Triassic period

passive transport

the movement of molecules across the cell membrane without the expenditure of energy

peptide bonds

the bond that holds two amino acids together

P generation

the original, or parent generation used in genetic crosses

phosphorus cycle

the absorption of phosphorus from the soil by plant roots and then by herbivores and the movement of phosphorus back to the soil from the decay of dead plants and animals

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