PLS HELP! WILL GIVE BRAINLIST!

what is the original source of the energy that flows through most ecosystems? what would happen without this source?

Light energy or chemical energy

Explanation:

Light energy or chemical energy support the whole pyramid. Without it, plants/producers would die (they wouldn't be able to photosynthesize or chemo synthesize), leaving the first level consumers with no food, thus leaving the second level consumers with no food, and so on.

Hope this helped!

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

i believe the answer would be b. hope it : )