Passage Two
28. What is the cause of the recent changes in Alaska?
Passage Two
One of the reasons for our success as a species
is our ability to eat and thrive on a large variety of foods.
One of the reasons for our success as a species
is our ability to eat and thrive on a large variety of foods.
Many animal species have become extinct or
are on the edge of extinction partly because they lack this adaptability.
Many animal species have become extinct or
are on the edge of extinction partly because they lack this adaptability.
They need to feed on a particular kind of plant
or a particular kind of animal or insect.
They need to feed on a particular kind of plant
or a particular kind of animal or insect.
If this source of food is for any reason removed,
then the animal concerned is unable to change to a different diet.
If this source of food is for any reason removed,
then the animal concerned is unable to change to a different diet.
Gradually it becomes extinct.
We know that many animal species have died out,
Gradually it becomes extinct.
We know that many animal species have died out,
but so have some human species such as the early form of man
that is called Neanderthal man.
but so have some human species such as the early form of man
that is called Neanderthal man.
Perhaps part of the reason for his failure to survive was
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