 
 <translate> Energy enters ecosystems in the form of sunlight or chemical compounds. If there is sun, there is sunlight, there is day. Energy enters ecosystems from the sun.
Thus, the answer is (B). <ibo> Ike na-abanye n'ihe ndị e kere eke n'ụdị ìhè anyanwụ ma ọ bụ ihe ndị e ji emepụta kemikal. Ọ bụrụ na e nwere anyanwụ, e nwere ìhè anyanwụ, e nwere ehihie. Ike na-esi n'anyanwụ abanye n'ihe ndị dị ndụ. N'ihi ya, azịza ya bụ (B). 