a group of living organisms of the same kind living in the same place at the same time.
What is population?
100
An organ of the body that pumps blood throughout the body
What is a heart?
100
a series of organs responsible for taking in oxygen and expelling carbon dioxide.
What is the respiratory system?
100
the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.
What is the water cycle
100
The organelle that holds DNA
What is a nucleus?
200
the field of Biology that studies the relationship between living beings and between living beings and the environment.
What is ecology?
200
the control center for your body and it sits in your skull at the top of your spinal cord.
What is the brain
200
the network of nerve cells and fibers that transmits nerve impulses between parts of the body.
What is the nervous system?
200
an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.
What is the rock cycle
200
the semipermeable membrane surrounding the cytoplasm of a cell.
What is the cell membrane
300
a system composed of biotic and abiotic factors in interaction.
What is an ecosystem?
300
the internal organ in which the major part of the digestion of food occurs, being (in humans and many mammals) a pear-shaped enlargement of the alimentary canal linking the esophagus to the small intestine.
What is the stomach
300
the body's defense against infectious organisms and other invaders.
What is the immune system
300
the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation and decomposition.
What is the nitrogen cycle
300
a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria.
What is the cell wall
400
a set of all of the ecosystems of the planet.
What is a biosphere?
400
each of the pair of organs situated within the rib cage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide be removed.
What is the lung
400
the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
What is endocrine system?
400
the series of processes by which carbon compounds are interconverted in the environment, chiefly involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
What is the carbon cycle
400
a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport
What is the Golgi apparatus?
500
An organism that can produce their own food
What is an producer?
500
a large lobed glandular organ in the abdomen of vertebrates, involved in many metabolic processes
What is the liver
500
the network of vessels through which lymph drains from the tissues into the blood.
What is the lymphatic system?
500
the biogeochemical cycle that describes the movement of oxygen within its three main reservoirs: the atmosphere (air), the total content of biological matter within the biosphere (the global sum of all ecosystems), and the lithosphere (Earth's crust).
What is the oxygen cycle
500
an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).