Question

es 1B) Choose the correct alternative and rewrite the alternative. {M-2}
----- is the step at which the organism obtain its food in the food chain.
a trophic level
b) food web
c)bio-geo chemical cycle d) denitrification.
2) Oxygen forms the
% of the atmosphere.
b) 21
c) 78
d)22​

Answer 1

Answer:

the answer is 2 Oxygen forms the atmosphere