Essentials
for life
All living thing share
certain basic needs they
must have waters,
for without it
the chemistry of
life is not
possible. The fact that earth has
liquid water on its surface
is main reason
why most of these basic
necessities.
living requirement
white
all living thing needed the
same essentials many have
more specific requirement for explain
, plants and animals gets their energy in very different ways –
plants needed sunlight, while animals
needs energy-rich foods. But few forms
of life can manage without most of these basic necessities.
Energy pyramid
Most
naturals habitats have many
organisms that produce food,
and several levels of food
consumers. This patch
of wild grassland
supported several rabbits, and
only one fox-the top predator. There are
fewer consumers at the upper level, because
at each level some
energy is turned into
activity and heat
instead of food for the next link in the chain. This
means that it
takes a lot of grass
to support one
fox, and explains
why foxes are
much rarer than
rabbits.
Under threat
In
every kingdom of
life there are
species that are threatened with
extinction. There are many
reasons for this ,
but most of them are the
result of humans activity. Some animals are deliberately
killed ,including rare species.
Vast areases of wild
habitat have been destroyed, denying
wildlife its basic
needs such as
living space and food.
But creating wildlife
reserve can help save
many species and plants
destroyed of habitats such
as tropical rain forest is threating the
amazing diversity of plants life. Although fish are not as
threating as some animals,
pollution and overfishing have made
many species scarce. the hardest hit of all are the frogs,
salamanders, and other amphibians,
with a third of all known
species vanishing fast.
Hunting and losing
of their natural habitals
have made the future
uncertain for at
least 12 per cent
of birds species. One in every
five mammals species
is threatened, including gaint such as rhinos
and elephants.
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