2 Points
Which of these is an advantage of hydroelectric energy?
O
A. Is available in limited areas
O
B. Is a renewable energy source
O
C. Harms aquatic organisms
O
D. Is expensive to build or maintain

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )