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42 Cards in this Set

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  • Back
natural
Existing in, or produced by nature
natural selection
The principle that in a given environment individuals having characteristics that aid survival will produce more offspring, and the proportion of individuals
having such characteristics will increase with each succeeding generation.
nesting
To build or occupy a nest; settle in
neutral
Neither acidic nor basic (as in pH)
neutrons
An uncharged elementary particle that has a mass nearly equal to that of the
proton and is present in atomic nuclei
nuclear
Used in or produced by a nuclear reaction; referring to particles or properties of
an atomic nucleus
nuclear reaction
A change in the identity or characteristics of an atomic nucleus that results when
it is bombarded with an energetic particle
nucleus
1. The positively charged central portion of an atom that comprises nearly all of
the atomic mass and that consists of protons and neutrons. 2. The portion of a
eukoryotic cell that is surrounded by a nuclear membrane and contains DNA
nutrient
A nutritive substance or ingredient
observe
To watch carefully, especially with attention to details or behavior for the
purpose of arriving at a judgment
ocean trench
A long, narrow, deep depression in the ocean bed.
omnivore
An animal that feeds on both animal and vegetable substances
orbit
A path described by one body in its revolution about another (as by the Earth
about the sun or by an electron about an atomic nucleus).
organ
A differentiated structure (such as a heart, kidney, leaf or stem) consisting of cells
and tissues, and performing some specific function in an organism.
organ systems
Organs working together for a specific function.
organic
Compounds containing carbon and chiefly or ultimately of biological origin.
organism
An individual constituted to carry on the activities of life by means of organs
separate in function but mutually dependent; a living being
oxidation
Combination of a substance with oxygen
oxidize
To combine with oxygen
parasite
An organism living in, with or on another organism in which a parasite obtains
benefits from a host that it usually injures.
particle
Any of the basic units of matter and energy (such as a molecule, atom, proton,
electron or photon
pattern
reliable sample of traits, acts, tendencies or other observable characteristics
periodic table
An arrangement of chemical elements based on the periodic law.
pH scale
A numerical measure of the acidity or alkalinity of a chemical solution
phenomenon
A fact or event of scientific interest susceptible to scientific description and
explanation.
photosynthesis
The chemical process by which chlorophyll-containing plants use light to convert carbon dioxide and water into carbohydrates, releasing oxygen as a byproduct
physical change
A property of a material that can be observed without changing the chemical
makeup of the material
physiology
The biological science of essential and characteristic life processes, activities and
functions.
pitch
The property of a sound, especially a musical tone, that is determined by the
frequency of the waves producing it; highness or lowness of sound
planet
Any of the large bodies that revolve around the sun in the solar system
pollution
A substance that, when added to the environment causes the environment to be
harmful or unfit for living things.
population
All the plants or animals of the same kind found in a given area
potential energy
The energy that matter has because of its position or because of the arrangement
of atoms or parts.
precipitation
deposit on Earth of hail, mist, rain, sleet or snow
predator
An animal that lives by capturing prey as a means of maintaining life
prey
An animal taken by a predator as food
producer
Any of various organisms (such as a green plant) which produce their own
organic compounds from simple precursors (such as carbon dioxide and
inorganic nitrogen) and many of which are food sources for other organisms.
prokaryotic
A cellular organism (such as a bacterium or a blue-green alga) that does not have
a distinct nucleus
property
A quality or trait belonging to an individual or thing
proton
A stable subatomic particle occurring in all atomic nuclei with a positive electric
charge equal in magnitude to that of an electron.
qualitative
Involving quality or kind
quantitative
Involving the measurement of quantity or amount.