the scientific study of interactions among organisms and between organisms and their environments, or surroundings
Contains the combined portions of the planet in whcih all of life exists, including land, water, and air, or atmosphere. the highest level of organization
a group of organisms so similar to one another that they can breed and produce fertile offspring.
Groups of individuals that belong to the same species and live in the same area.
Assemblages of different populations that live together in a defined area.
A collection of all the organisms that live in a particular place.
A group of ecosystems that have the same climate and similar dominant communities
the main energy source for life on Earth
Plants, some algae, and certain bacteria that capture energy from sunlight or chemicals and use that energy to produce food
make their own food, also called autotrophs
When autotrophs use light energy to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates such as sugars and starches
When organisms use chemical energy to produce carbohydrates; this process is performed by several types of bacteria.
Organisms that rely on other organisms for their engery and food supply
also known as heterotrophs, organisms that eat other organisms for their energy.
A heterotroph that obtains energy by eating only plants.
A heterotroph that obtains energy by eating other animals.
A heterotroph that obtains energy by eating both plants and animals.
A heterotroph that feeds on plant and animal remains and other dead matter.
A heterotroph that breaks down inorganic matter.
flows through an ecosystem in one direction, from the sun or inorganic compounds to autotrophs and then to various heterotrophs.
A series of steps in which organisms transfer energy by eating and being eaten.
Links all the food chains in an ecosystem together.
how much energy is passed on between each trophic level
Each step in a food chain or food web
A diagram that shows the relative amounts of energy or matter contained within each trophic level in a food chain or food web.
Shows the relative amount of energy available at each trophic level. Organisms use about 10% of this energy for life processes, the rest is lost as heat
Represents the amount of living organic matter at each trophic level. Typically, the greatest biomass is at the base of the pyramid; shows the mass of each level
Pyramid of Numbers
Shows the relative number of individual organisms at each trophic level Does not necessarily have the shape of a pyramid
The total amounth of living tissue within a given trophic level
Recycled within and between ecosystems
Elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another.
The process by which water changes from liquid form to an atmospheric gas
When water enters the atmosphere by evaporating from the leaves of plants
All the chemical substances that organisms need to stay alive. passed between organisms and the environment through biogeochemical cycles
When bacteria, which live in the soil and on the roots of plants called legumes, convert nitrogen gas into ammonia.
When soil bacteria convert nitrates into nitrogen gas; this process releases nitrogen into the atmosphere.
The rate at which organic matter is created by producers. one factor that controls this is the amount of available nutrients.
When an ecosystem is limited byt a single nutrient that is scarce or cycles very slowly.
When an aquatic ecosystem recieves a large input of a limiting nutrient - for example, runoff from heavily fertilized fields - the result is oftan an immediate increase in the amounth of algaue and other producers. what is this called?
Moves between the ocean, atmosphere, and land. has the processes of evaporation, transpiration, condensation, and precipitation.
contains biological processes, geochemical processes, mixed biogeochemical processes, and human activities.
Cycles through soil, the atmosphere, and the tissues of living organisms. It's main reservoir is the atmosphere. Contains denitrification,.
Cycles among the land, ocean sediments, and living organisms. does not have an atmosphere reservoir.
IN a food cahin where a snake eats a frog that ate an insect that ate a plant, the snake is a...
what are all the levels of organization?
how does water return to Earth from the atmosphere?
What element helps build amino acids?
what element is needed for a genetic code?
What is taken from the atmosphere during photosynthesis?