other forms of life can be found in very dry areas like deserts.
however, for any form of life to exist, conditions must be right.
when conditions are not right, that form of life will become extinct.
to become extinct means to die out completely.
millions of years ago there were forms of life that no longer exist
one extinction event happened about 250 million years ago.
96% of all life in the oceans died out
this event happened over a period of several million years.
some scientists believe that there were several causes.x
they believe that a series of events caused the extinctions.
scientists are working to better understand what really happened
possible causes include large volcanic eruptions and global warming.
vocabulary-Instruments
units of weight include kilograms and pounds, and units of length include centimeters and inches.
these instruments are used to observe very large and ver small objects.
telescopes are used by astronomers,and microscopes are used by biologists and doctors.
these appliances are used in the kitchens of almost every home.
stoves are used to heat food,and refrigerators are used to keep foods cool or cold.
Household tools like these are used to build and repair things
Hammers are used to pound in nails and screwdrivers are used to turn a screw
Dialogue--Dating anniversary
do you know what day it is today?
what do you mean? it is a special day?
oh so you don‘t remember.
remember one. what's so special.
its our anniversary.
we start a dating a year today
oh really ？sorry
what you think of this
oh its a necklace
do you like it
yes i do.its lovely and its special light heart
may i put it on
no,let me do it
so you did remember
of course i remember
its a very special day for both of us
i have something for you too
you do?
yes but we have to wait until later
oh i cant wait
tell me what it is
can you guess what it is?
could you give me a hain
we went there six month ago
oh you
yes are you excited?
yes that's ture
i also remember the deserver do you ?
wa the mune looks great and a specialist fish
yes it looks good
yes but this prise is too high dont you think?
yes they are a bit too high
but dont you think im worth it
let's enjoy ourselves
ok if you put that way
let see if we can get a table
im glad you have your credit card
i sure hope the food is good
staff worrying
Life exists in a variety of conditions\
we started dating a year ago today
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