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biology
common assessment
23
Biology
9th Grade
11/08/2012

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Term
ecosystem
Definition
a physical enviornment with different species that interact with one another and with nonliving things
Term
homeostasis
Definition
is the maintenance of constant internal conditions in an organism
Term
evolution
Definition
is the change in living things over time
Term
adaption
Definition
an inherited trait that gives an advantage to individual organisms and is passed on to future generations
Term
observation
Definition
includes uses our senses to study the world, but it may also involve other tools
Term
data
Definition
observations that also can be recorded as data that can be analyze
Term
hypothesis
Definition
a proposed answer for a scientific question. must be specific and testable.
Term
expierments
Definition
scientists study factors called independent variables and dependent variables to find cause-and-effect relationship
Term
independent variable
Definition
an experiment is a condition that is manipulated,or changed,by a scientist
Term
dependent variable
Definition
observed and measured during an experiment;they are the experimental data
Term
constants
Definition
the conditons that do not change during an experiment
Term
theory
Definition
a proposed explaination for a wide range of observations and experimental results that is supported by a wide range of evidence
Term
atom
Definition
the smallest basic unit of matter
Term
element
Definition
one particular type of atom,and it can't be broken down into a simpler substance by ordinary chemical names
Term
compound
Definition
a substance made of atoms of different elements bonded togther in a certain ratio
Term
ion
Definition
an atom that has gained or lost one or more electrons
Term
ionic bond
Definition
forms through the electrical force between oppositely charged ions
Term
covalent bond
Definition
forms when atoms share a pair of electrons
Term
molecule
Definition
two or more atoms held together by covalent bonds
Term
hydrogen bond
Definition
an attraction between a slightly positive hydrogen atom and a slightly negative atom,often oxygen or nitrogen
Term
cohesion
Definition
attraction among molecules of a substance
Term
adhesion
Definition
attraction among molecules of different molecules
Term
solution
Definition
a mixture of substances that is the same through-out-it is a homogeneous mixture
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