Why do vaccines work for some diseases but not others? The antigens produced by a vaccine only fight specific antibodies.
Vaccines only work against viral infections.
Vaccines only work against bacterial infections.
The antibodies produced by a vaccine only fight specific antigens.

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

Individuals do not compete directly for resources, but are prey for the same predator

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt