planted
(B) some quick growing annuals should be planted if a tree must be cut
for other uses
(C) tree must be curt whenever necessary because the underground part
performs the useful purpose
(D) a tree should be planted in place of one to be cut
- A biosphere is composed of
(A) living organisms
(B) living organisms and lithosphere
(C) living organisms, lithosphere and atmosphere
(D) living organisms, lithosphere, atmosphere and hydrosphere - Pyramid of energy in a forest ecosystem is
(A) always inverted (B) always upright
(C) both upright and inverted (D) first upright then inverted