What is the main function of xylem within a plant

What is a common risk associated with tobacco?

How will your health most likely be affected if you follow the recommended guidelines for sleep, rest, and physical activty

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.