Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account


organisms that use energy from sunlight or from chemical bonds in inorganic substances to make organic compounds


compound made up of carbon, hydrogen, and oxygen atoms; major source of energy for the human body


The basic unit of all living things

chemical energy

a form of potential energy that is stored in chemical bonds between atoms


an organism that obtains energy and nutrients by feeding on other organisms or their remains.


living and nonliving things in an environment, together with their interactions

first law of thermodynamics

energy is neither created nor destroyed, but may be converted from one form to another


The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms; a group of like or different atoms held together by chemical forces


process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches


An organism that can make its own food.

biogeochemical cycles

process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another

carbon cycle

The organic circulation of carbon from the atmosphere into organisms and back again.

cellular respiration

the process by which cells obtain energy from carbohydrates; atmospheric oxygen combines with glucose to form water and carbon dioxide


a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

deoxyribonucleic acid

(DNA) nucleic acid that contains the sugar deoxyribose

element energy

farther the last energy level is from the nucleus, the easier it is to remove the electrons

kinetic energy

energy of motion

net primary production

The amount of energy accumulated in plant biomass that is available to the consumers in an ecosystem

potential energy

Energy that is stored and held in readiness

second law of thermodynamics

States that with each successive energy transfer or transformation in a system, less energy is available to do work.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording