Environmental Science
The pyramid of number of a parasitic food chain in forest ecosystem is

always inverted
sometimes inverted and sometimes upright
mixture of inverted and upright
always upright

ANSWER DOWNLOAD EXAMIANS APP

Environmental Science
Biogas is composed of

carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur
ethane, carbon dioxide, nitrogen and hydrogen

ANSWER DOWNLOAD EXAMIANS APP