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EVIDENCE NATURAL SELECTION
What evidence is there that HUMAN EVOLUTION D______ proposed the theory of
evolution is happening? e______ to explain how species
How are human beings change over time. There is
different from apes? v_______ between individuals,
· bigger b_____ those that are better a_______
· w_____ upright are more likely to s________ and
r________, passing on favorable
characteristics.
LAMARCK
Believed that
EVOLUTION acquired
characteristic
SELECTIVE BREEDING
s can be
What is selective breeding?
inherited
B3 - Life on Earth
How does it differ from natural selection?
COMMUNICATION
SYSTEMS
What resources are Nerves Hormones
plants and animals in
competition for?
· Speed of response
EXTINCTION
·
· Causes of extinction: Chemical or
· increased electrical
c_______
· New p________ How is it carried?
· e_________
change…read more

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Label the parts of Complete the table: Radioactive atoms are u_____
the atom: Type of Symbol Stopped by.... Ionizing and decay emitting radiation.
radiation power R______ d____ helps atoms
(strong/poor/m to become more stable. As a
P____
edium) radioactive atom decay its
activity drops. H____ l_____
E_____ is the time it takes for
N_____ radioactivity to halve,
different substances have
different h____ l_____.
Helium atom
USES OF
BACKGROUND RADIATION RADIOACTIVITY
Where does background HALF-LIFE Give some examples of
variation come from? ATOMS TYPES OF RADIATION the uses of
______________________ radioactivity:
______________________ ________________
______________________ ________________
______________________ ________________
P3 ­ Radioactive Materials ________________
GENERATING ELECTRICITY ________________
________________
Label the parts of a power station: NUCLEAR ________________
RENEWABLE ENERGY FISSION ________________
(Higher only)
Come up with 3 renewable sources of energy which
are alternatives to fossil fuels or nuclear power...
N_____ f_____ takes
place in the nucleus of
Energy Source Advantage Disadvantage
the a_____. A n______
is absorbed by a uranium
nucleus. The nucleus is
1. ______________ split releasing e______.
2. ______________ A c_____ r______ can
3. ______________ be started releasing
4. ______________ further energy.…read more

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