Which of the following requires the action of a first class lever in the body?
a. jumping
b. push-ups
c. waving
d. nodding

How might expectations or rules at a job differ from those at your home?

Blood cells bring oxygen to cells and take carbon dioxide away. true or 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.