To relieve pressure or pain in a person's head, even ancient cultures drilled holes in the skull, a practice called
a. cranial puncture.
b. black magic.
c. trephination.
d. autopsy.

Which of the following represents a difference between viruses and viroids? a) viruses infect many types of cells, whereas viroids infect only prokaryotic cells.b) viruses have capsids composed of protein, whereas viroids have no capsids.c) viruses have genomes composed of rna, whereas viroids have genomes composed of dna.d) viruses cannot pass through plasmodesmata, whereas viroids can.