What carries oxygen and nutirence to every cell in the body

The body uses fight or flight as a way of defending itself from stress. question 2 options: true false

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.

Which a hammer strikes a compound formed by covalent bounds