something that is living, was once living, or comes from something living
nonliving, physical features of the environment, including air, water, sunlight, soil, temperature, and climate
the process by which nitrites and nitrates are produced by bacteria in the soil
the circulation and reutilization of carbon atoms especially via the process of photosynthesis and respiration.
Treeless arctic or alpine biome characterized by cold, harsh winters, a short growing season, and potential for frost any month of the year; vegetation includes low-growing perennial plants, mosses and lichens
has long severe winters and short cool summers. temperature only reaches 50 degrees F. Recieves 20 inches of percipatation per year (mostly snow) it has pine trees, spruses, fir trees, conifer trees, moose, wolves, and deer.
Temperate decidous forest
characterized by trees that lose all of their leaves in the fall, characterized by hardwood trees, and broad leaved trees and shrubs
too dry for forests, too moist for deserts, grasses and other flowering plants, wild horses, asses, and antelope, bison, kangaroos, antelopes, and other large herbivores
dry areas where precipitation is less than 30cm a year, succulent plants (cactus) and scattered grasses
a region of grassland with scattered trees lying between the equatorial forest and the hot deserts in either hemisphere.
In this biome it rains almost everyday. Temperatures are high with little difference between day and night temperatures. There are more organisms living here than anywhere else on Earth.
bacteria that live under extreme conditions such as: high temperature, high salt content, and low oxygen, considered to be the most ancient organisms on the planet,
known as “true bacteria”, largest of the two bacterial kingdoms, contains disease causing bacteria
tiny non-living particles , smaller than bacteria and other pathogens, which must invade living cells in order to reproduce; when they invade, the cells are damaged or destroyed in the process releasing new particles to infect other cells
The basic unit of all living things
animals with a backbone
Animals without backbones
called founder of modern taxonomy; Invented binomial nomenclature
practice of classifying plants and animals according to their presumed natural relationships
the system of naming organisms by using their genus species classifications.
First and largest category used to classify organisms
Phylum or division
major classification, second to kingdom, of plants and animals; category ranking below a kingdom and above a class; division
in a traditional taxonomic system, the category contained within a phylum or division and containing orders
taxonomic group containing one or more families
In classification, the taxonomic category above genus.
a classification grouping that contains similar, closely related organisms, contains 1 or more species.
a group of organisms so similar to one another that they can breed and produce fertile offspring
(biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms
eukaryotic one-celled living organisms distinct from multicellular plants and animals: protozoa, slime molds, and eukaryotic algae
a kingdom of eukaryotic organisms. They are heterotrophic and digest their food externally, absorbing nutrient molecules into their cells. Yeasts, molds, and mushrooms are examples.
a classification kingdom made up of eukaryotic, multicellular organisms that have cell walls made mostly of cellulose, that have pigments that absorb light, and that supply energy and oxygen to themselves and to other life-forms through photosynthesis
Kingdom of the most complex organisms; multi-cellular, heterotrophic, lack rigid cell walls, mobile, tissues in internal organs, sensory organs, nervous system
scientific study of interactions among organisms and between organisms and their environment
a living thing that has (or can develop) the ability to act or function independently
a group of organisms of the same species populating a given area
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
a system formed by the interaction of a community of organisms with their physical environment
the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
any biotic or abiotic factor that restricts the existence, numbers, reproduction, or distribution of organisms, ex. carrying capacity of land, disease, population density, population distribution
a symbiotic relationship that benifits one organism without harming the other
symbiotic relationship in which both species benefit from the relationship
the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage)
interaction in which one organism captures and feeds on another organism, usually killing the prey.
an ecological succession that begins in a an area where no biotic community previously existed
Sequence of community changes that take place after a community is disrupted by natural disasters or human actions.
a relatively stable long-lasting community reached in a successional series; usually determined by climax and soil type
An autotroph, usually a photosynthetic organism. Collectively, autotrophs make up the trophic level of an ecosystem that ultimately supports all other levels.
An herbivore; an organism in the trophic level of an ecosystem that eats plants or algae
Organism that feeds only on primary consumers.
a member of the trophic level of an ecosystem consisting of carnivores that eat mainly other carnivores.
organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer
organism that obtains energy from the foods it consumes; also called a consumer
an organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources
an organism that makes its own food
organism that breaks down the wastes or remains of other organisms
the continuous process by which water moves from Earth’s surface to the atmosphere and back
the emission of water vapor from the leaves of plants
the process by which molecules of water vapor in the air become liquid water
water that flows over the ground surface rather than soaking into the ground
the falling to earth of any form of water (rain or snow or hail or sleet or mist)
the process by which water changes from liquid form to an atmospheric gas
the process by which nitrites and nitrates are produced by bacteria in the soil
The assimilation of atmospheric nitrogen by certain bacteria into nitrogenous compounds that can be directly used by plants.
the formation of ammonia compounds in the soil by the action of bacteria on decaying matter
process in which fixed nitrogen compounds are converted back into nitrogen gas and returned to the atmosphere
the process by which cells obtain energy from carbohydrates; atmospheric oxygen combines with glucose to form water and carbon dioxide
process where organisms use the suns energy, carbondioxide, and water to produce oxygen and glucose.
A longitudinal rod of cells that forms in the least developed chordates and in embryonic stages of more developed chordates.
comprises true vertebrates and animals having a notochord, the group of animals that have a notochord at some point in their lives.
Division of an animal body along its length into a series of repeated parts called segments
invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
the period during which an embryo develops (about 266 days in humans)
of or near the head end or toward the front plane of the body(top)
tail end of bilaterally symmetric animals (bottom)
toward or on or near the belly (front of a primate or lower surface of a lower animal)
belonging to or on or near the back or upper surface of an animal or organ or part
the animal can be divided into two halves. Most of the organs and organ systems are on either side of the midline.
body plan which animals bod are organized in a circle around a central axis
individual that has both male and female reproductive organs
In animal development, a series of cell and tissue movements in which the blastula-stage embryo folds inward, producing a three-layered embryo, the gastrula.
The 3 germ layers
endoderm, mesoderm, ectoderm
the inner germ layer that develops into the lining of the digestive and respiratory systems
the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue
the outer germ layer that develops into skin and nervous tissue
Characteistics of the skeletal system
aids in movement, provides structure, produces blood cells
characteristics of respiratory system
gas exchange, responsible for maintaining blood oxygen levels
carries air between larynx and bronchi
two short branches located at the lower end of the trachea that carry air into the lungs.
tiny air chambers in the lungs that allow gases to be exchanged between the air and blood
large, flat muscle at the bottom of the chest cavity that helps with breathing
characteristics of the digestive system
mechanically and chemically digest food, breaks down food into smaller molecules that are usuable to other cells in the body
along with teeth begins the mechanical part of digestion
the concentration of sensory and brain structures in the anterior end of the animal
body system the breaks down food and absorbs nutrients
system responsible for taking in oxygen and releasing carbon dioxide using the lungs
internal skeleton or supporting framework in an animal
the exterior protective or supporting structure or shell of many animals (especially invertebrates) ex. insects, crawfish
large muscular sac that continues the mechanical and chemical digestion of food
The part of the digestive system in which most chemical digestion takes place
organ that makes bile to break down fats; also filters poisons and drugs out of the blood
a muscular sac attached to the liver that secretes bile and stores it until needed for digestion
a triangular organ that produces enzymes that flow into the small intestine
beginning with the cecum and ending with the rectum, the last section of the digestive system, where water is absorbed from food and the remaining material is eliminated from the body
systems that make up the excretory system
respiratory, digestive, urinary, Integumentary
made up of the brain and spinal cord
the lobes of the brain that integrate sensory information and coordinate the creature’s response to that information
the “little brain” attached to the rear of the brainstem; its functions include processing sensory input and coordinating movement output and balance
part of brain stem connecting brain to spinal cord, controls respiration and heartbeat