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The amazing success of humans as a species
is the result of the evolutionary development
of our brains which hassled to tool-using，
tool-making，the ability to solve problems by
logical reasoning，thoughtful cooperation，
CD6and language.One of the most striking ways
in that chimpanzees biologically resemble 【M1】______
humans lies in the structure of their trains.
The chimpanzee，with the capacity for primitive
reasoning，exhibits a type of intelligence like 【M2】______
that of humans than does any other mammal living
today.The brain of the modem chimpanzee is
probably not too dissimilar to the brain that
so many millions of years ago direct the behavior 【M3】______
of the first ape man.
In a long time，the fact that prehistoric 【M4】______
people made tools was considered to be one
of the major criterion distinguishing them 【M5】______
from other creatures.It is true that the
chimpanzee does not fashion tools to ’a
regular and set pattern’but then，prehistoric
people，after their development of 【M6】______
stone tools.
Undoubtedly poked around with sticks and
straws，at which stage it seems unlikely that
they made tools to a set pattern too.【M7】______
It is because the close association in 【M8】______
most people’s minds of tools with humans
that special attention has always been focused
upon any animal able to use an objective as a 【M9】______
tool；but it is important to realize that this ability，
on its own，does not necessarily indicate
any special intelligence in the creature concerning.【M10】______

First，the spotted owl was threatened by logging in the Pacific Northwest．Now it’s in danger from a new enemy，the barred owl．Barred owls have been moving to the Northwest from the eastern part of the United States．Stan Sovern has studied spotted owls．Now when he calls for spotted owls，barred owls are starting to appear．Sovern threw a mouse on the ground，and a barred owl grabbed it.Scientists have learned that spotted owls start to vanish when barred owls come．Some barred and spotted owls have mated and produced hybrid babies．One spotted owl was killed by a barred owl.Professor Ned K．Brown of the University of California-Berkeley says，’In some areas of Washington，the barred owls moved into very dense，deep woods．The same kind of woods that arc opened up，or destroyed by logging，that adversely influences the spotted owls.’Ten years have passed since the federal government began protecting the spotted owl．Loggers were forced to limit logging on seven million acres of government land．No one is sure how the arrival of the barred owls will impact laws that protect spotted laws．The barred owls like to live in the deep forests where loggers like to cut down trees．The barred owls will likely keep migrating to the Northwest.