At the beginning of a pandemic flu today, vaccines are always readily available.

true

false

The virus can spread quickly because most people will not be immune and a vaccine might not be widely available to offer immediate protection.

This is False

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