(Q).
Q: Memory t cells are long-lived and can even persist for how long? Choices: - eons - days - minutes - lifetime A:
(A).
lifetime

(Q).
Q: A virus is essentially dna or rna surrounded by a coat of what? Choices: - acids - paint - organism - protein A:
(A).
protein

(Q).
Q: What do wavelengths measure the size of? Choices: - winds - fossils - tides - waves A:
(A).
waves