Which of these is not true about interferons A) They help nearby cells fend off bacterial infections
B)they interfere with production of viruses
C) they are secreted by infected cells
D)they buy time for your specific defenses to mount an attack
NEED ASAP

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

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.