AND WELL DETAILED VERIFIED ANSWERS|GRADED A+|NEWEST
Biotic - ANSWER Living. Matter is considered ______ if it was ever alive at some point in
time
Abiotic - ANSWER Non-living, may be within or made by a living organism.
Atom - ANSWER Smallest level. The basic unit of matter. Consists of a dense nucleus sur-
rounded by electrons.
Molecule - ANSWER Second level. A chemical structure consisting of at least two atoms
held together by a chemical bond.
Cell - ANSWER Fourth level. The fundamental unit of life. Essentially a tiny droplet of wa-
ter and other molecules enclosed by a fluid "skin" or membrane. The smallest and simplest
entity that possesses all the characteristics of life.
Macromolecule - ANSWER Third level. Biologically important molecules that are techni-
cally polymers. Example: DNA.
Microorganism - ANSWER Sixth level. Single-celled life form. Consists of just one cell and
include unicellular organisms such as bacteria and protists.
Organelle - ANSWER Fifth level. Compartments inside the cell that contain specific groups
of macromolecules and carry out specific cellular functions. One of these organelles is the
nucleus; it encloses the DNA within the cell.
1
,Tissue - ANSWER Seventh level. Formed when similar cells work together to fulfill the
same detailed function.
Organ System - ANSWER Ninth level. Consists of functionally related organs. Mammals
have many.
Organ - ANSWER Eighth level. Collections of tissues that work together to carry out a
common general function. Present not only in higher level animals but also in plants.
Organism - ANSWER Tenth Level. Individual living entities that survive and reproduce as a
unit. For example, each tree in a forest.
Population - ANSWER Eleventh level. Consists of all the individuals of a species living
within a specific area.
Community - ANSWER Twelfth level. Populations can interact with each other in positive
and negative ways, and together they form this.
Ecosystem - ANSWER Thirteenth level. Consists of all the living things in a particular area
together with the abiotic, or nonliving, parts of that environment.
Biosphere - ANSWER Fourteenth level. The highest level of organization in living systems.
The collection of all ecosystems on Earth. Includes all habitable zones on the planet, includ-
ing land, soil, and rocks to a great depth in the Earth's crust; water and ice; and the atmos-
phere to a great height.
Emergent Properties - ANSWER Characteristics of a system that are not present in any of
its component parts.
Biology - ANSWER The scientific study of life and is the branch of science that studies liv-
ing organisms and the way organisms interact with their environments.
2
,Homeostasis - ANSWER The ability or tendency of organisms and cells to maintain stable
internal conditions.
Nutrient - ANSWER Any matter an organism needs but cannot make for itself.
Growth - ANSWER An increase in size.
Energy - ANSWER The capacity to do work or to make a change in the location, tempera-
ture, or structure of matter. Does not have mass and it does not take up space, but it can be
measured in terms of what it does.
Development - ANSWER Structure and function change in an orderly way as an organism
passes through its life cycle. An individual's pattern of _______ is partly determined by ge-
netic instructions.
Reproduction - ANSWER Occurs when an individual organism passes on its genetic infor-
mation to a newly independent organism, or offspring.
Natural Selection - ANSWER Individuals are always a bit different from their parents and
from each other, partly because of changes to their genes. These differences may be helpful
or harmful to the individuals that inherit them. In nature, individuals often have very low
odds of surviving to reproduce. Individuals with slightly harmful or even average characteris-
tics might be less likely to make it, and those with traits that fit in very well with the local
habitat will have the greatest chance to survive and reproduce. This sorting process goes on
generation after generation.
Evolution - ANSWER A scientific theory that explains how and why life changes over time.
Provides the explanation for why all living organisms share profound similarities, and yet,
the life forms on our planet are so incredibly diverse.
3
, Atomic Mass - ANSWER The sum of the number of protons and the number of neutrons.
The mass of an atom.
Atomic Number - ANSWER The number of protons in an atom, displayed for each atom in
the periodic table.
Chemical Bonds - ANSWER Attractions between atoms that hold atoms and molecules to-
gether.
electron - ANSWER Subatomic particle, located in shells on the outside of the nucleus,
has a negative charge and almost no mass.
Covalent Bonds - ANSWER Strongest chemical bond. Occurs between atoms of in the
same molecule. Electron pairs are shared, creating a strong bond between atoms.
electronegativity - ANSWER A measure of the tendency of an atom to attract a bonding
pair of electrons. How strongly does an atoms attract bonding electrons to itself?
element - ANSWER Atoms with unique properties, designated by the atomic number.
hydrogen bond - ANSWER Weak chemical bond. Occurs between atoms in different mole-
cules or parts of molecules. Weak electrostatic attraction between areas of molecules with
opposite partial charges.
ion - ANSWER Positively or negatively charged atom.
ionic bond - ANSWER Moderately strong chemical bond. Occurs between atoms in the
same molecule. Electrons transfer from one atom to another.
matter - ANSWER Anything that occupies space and has mass.
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Biotic - ANSWER Living. Matter is considered ______ if it was ever alive at some point in
time
Abiotic - ANSWER Non-living, may be within or made by a living organism.
Atom - ANSWER Smallest level. The basic unit of matter. Consists of a dense nucleus sur-
rounded by electrons.
Molecule - ANSWER Second level. A chemical structure consisting of at least two atoms
held together by a chemical bond.
Cell - ANSWER Fourth level. The fundamental unit of life. Essentially a tiny droplet of wa-
ter and other molecules enclosed by a fluid "skin" or membrane. The smallest and simplest
entity that possesses all the characteristics of life.
Macromolecule - ANSWER Third level. Biologically important molecules that are techni-
cally polymers. Example: DNA.
Microorganism - ANSWER Sixth level. Single-celled life form. Consists of just one cell and
include unicellular organisms such as bacteria and protists.
Organelle - ANSWER Fifth level. Compartments inside the cell that contain specific groups
of macromolecules and carry out specific cellular functions. One of these organelles is the
nucleus; it encloses the DNA within the cell.
1
,Tissue - ANSWER Seventh level. Formed when similar cells work together to fulfill the
same detailed function.
Organ System - ANSWER Ninth level. Consists of functionally related organs. Mammals
have many.
Organ - ANSWER Eighth level. Collections of tissues that work together to carry out a
common general function. Present not only in higher level animals but also in plants.
Organism - ANSWER Tenth Level. Individual living entities that survive and reproduce as a
unit. For example, each tree in a forest.
Population - ANSWER Eleventh level. Consists of all the individuals of a species living
within a specific area.
Community - ANSWER Twelfth level. Populations can interact with each other in positive
and negative ways, and together they form this.
Ecosystem - ANSWER Thirteenth level. Consists of all the living things in a particular area
together with the abiotic, or nonliving, parts of that environment.
Biosphere - ANSWER Fourteenth level. The highest level of organization in living systems.
The collection of all ecosystems on Earth. Includes all habitable zones on the planet, includ-
ing land, soil, and rocks to a great depth in the Earth's crust; water and ice; and the atmos-
phere to a great height.
Emergent Properties - ANSWER Characteristics of a system that are not present in any of
its component parts.
Biology - ANSWER The scientific study of life and is the branch of science that studies liv-
ing organisms and the way organisms interact with their environments.
2
,Homeostasis - ANSWER The ability or tendency of organisms and cells to maintain stable
internal conditions.
Nutrient - ANSWER Any matter an organism needs but cannot make for itself.
Growth - ANSWER An increase in size.
Energy - ANSWER The capacity to do work or to make a change in the location, tempera-
ture, or structure of matter. Does not have mass and it does not take up space, but it can be
measured in terms of what it does.
Development - ANSWER Structure and function change in an orderly way as an organism
passes through its life cycle. An individual's pattern of _______ is partly determined by ge-
netic instructions.
Reproduction - ANSWER Occurs when an individual organism passes on its genetic infor-
mation to a newly independent organism, or offspring.
Natural Selection - ANSWER Individuals are always a bit different from their parents and
from each other, partly because of changes to their genes. These differences may be helpful
or harmful to the individuals that inherit them. In nature, individuals often have very low
odds of surviving to reproduce. Individuals with slightly harmful or even average characteris-
tics might be less likely to make it, and those with traits that fit in very well with the local
habitat will have the greatest chance to survive and reproduce. This sorting process goes on
generation after generation.
Evolution - ANSWER A scientific theory that explains how and why life changes over time.
Provides the explanation for why all living organisms share profound similarities, and yet,
the life forms on our planet are so incredibly diverse.
3
, Atomic Mass - ANSWER The sum of the number of protons and the number of neutrons.
The mass of an atom.
Atomic Number - ANSWER The number of protons in an atom, displayed for each atom in
the periodic table.
Chemical Bonds - ANSWER Attractions between atoms that hold atoms and molecules to-
gether.
electron - ANSWER Subatomic particle, located in shells on the outside of the nucleus,
has a negative charge and almost no mass.
Covalent Bonds - ANSWER Strongest chemical bond. Occurs between atoms of in the
same molecule. Electron pairs are shared, creating a strong bond between atoms.
electronegativity - ANSWER A measure of the tendency of an atom to attract a bonding
pair of electrons. How strongly does an atoms attract bonding electrons to itself?
element - ANSWER Atoms with unique properties, designated by the atomic number.
hydrogen bond - ANSWER Weak chemical bond. Occurs between atoms in different mole-
cules or parts of molecules. Weak electrostatic attraction between areas of molecules with
opposite partial charges.
ion - ANSWER Positively or negatively charged atom.
ionic bond - ANSWER Moderately strong chemical bond. Occurs between atoms in the
same molecule. Electrons transfer from one atom to another.
matter - ANSWER Anything that occupies space and has mass.
4
