In humans, the maintenance of a balanced ph is achieved through a compound called a(n) a. acid b. alkali c. buffer d. electrolyte

Most organisms, including humans, need to maintain a certain pH within a fairly, narrow range in order to sustain life. This is achieved through a compound called buffer that can resist changes in pH, which is key to maintaining stable hydrogen ions. For instance, human blood needs to keep its pH at around 7.4 so human can survive.

the answer is trees if i'm not mistaken

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.