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26.14: N

Difficulty Level: At Grade Created by: CK-12
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natural resource
something supplied by nature that helps support life
natural selection
evolutionary process in which some living things produce more offspring than others so the characteristics of organisms change over time
nature-nurture debate
debate over the extent to which genes (nature) or experiences in a given environment (nurture) control traits such as animal behaviors
nectar
sweet, sugary liquid produced by the flowers of many angiosperms to attract animal pollinators
Nematoda
phylum of invertebrates called roundworms, which have a pseudocoelom and complete digestive system
neocortex
layer of nerve cells covering the cerebrum of the mammalian brain that plays an important role in many complex brain functions
nephron
structural and functional unit of the kidney that filters blood and forms urine
nerve
one of many cable-like bundles of axons that make up the peripheral nervous system
nerve impulse
electrical signal transmitted by the nervous system
nervous system
human body system that carries electrical messages throughout the body
nervous tissue
tissue made up of neurons, or nerve cells, that carry electrical messages
neuron
nerve cell; structural and functional unit of the nervous system
neurotransmitter
chemical that carries a nerve impulse from one nerve to another at a synapse
niche
role of a species in its ecosystem that includes all the ways the species interacts with the biotic and abiotic factors of the ecosystem
nitrogen cycle
interconnected pathways through which nitrogen is recycled through the biotic and abiotic components of the biosphere
nitrogen fixation
process of changing nitrogen gas to nitrates that is carried out by nitrogen-fixing bacteria in the soil or in the roots of legumes
nondisjunction
failure of replicated chromosomes to separate during meiosis II, resulting in some gametes with a missing chromosome and some with an extra chromosome
nonrenewable resource
natural resource that exists in a fixed amount and can be used up
notochord
stiff support rod that runs from one end of the body to the other in animals called chordates
nucleic acid
organic compound such as DNA or RNA
nucleotide
small molecule containing a sugar, phosphate group, and base that is a building block of nucleic acids
nucleus (plural, nuclei)
organelle inside eukaryotic cells that contains most of the cell’s DNA and acts as the control center of the cell
nutrient
substance the body needs for energy, building materials, or control of body processes

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    Date Created:
    Feb 23, 2012
    Last Modified:
    Sep 13, 2016
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