21. In the following diagram, nerve cell A is commu- nicating with nerve cell B. Identify the structures
present on the membranes of nerve cell B that
enable it to detect a message from nerve cell A.
26.
stre
Nerve cell A
Nerve cell B

heat a spark and oxygen

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.

idk

explanation:

im not intirely sure but i think the anwser is d relative humidity