The most critical element in an ecosystem is the
growth per day
energy flow within the system
number of organism in the system
location of the system
Correct answer is B
No explanation has been provided for this answer.
Which of the following is not a cause of desertification in West Africa?
constant high temperature
deforestation
overcultivation
overgrazing
Correct answer is A
No explanation has been provided for this answer.
The vegetation type characterized by short grasses and stunted tress is the
warm temperature grassland
sudan savanna
guinea savanna
cool temperature grassland
Correct answer is B
No explanation has been provided for this answer.
The major difference between the tropical rain-forest and savanna vegetation
and the rain-forest never occur on the same continent
is natural while the rain-forest is derived
grows in layers while the rain-forest does not
has less spcies of plants while the rain-forest has diverse species of plants
Correct answer is D
No explanation has been provided for this answer.
In which of the following order is copper produced?
blasting-crushing-floating-smelting
blasting-crushing-floting-grinding-smelting
blasting-crushing-grinding-floting-smelting
crushing-blasting-grinding-smelting-floting
Correct answer is C
No explanation has been provided for this answer.