D snails, guppies and plants. The community should be diverse and have lots of biodiversity.
All problems are caused by a factor in which human beings play an important role in its cause.
An open system is
when there is a transfer of energy and matter with its surroundings.
A closed system is
where there is a transfer of energy, may it be heat or work, but not matter
with its surroundings.
An isolated system
is where there is no transfer of energy or matter with its surroundings.
