How are respiratory illnesses primarily spread? coughing and sneezing
contact with contaminated food
drinking contaminated water
bites from infected organisms

coughing and sneezing

bc blah

explanation:

bc blah

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands