The chemical formula of a compound describes the elements the compound contains and the A pH of the compound,
B
conduction of the compound,
С
ratio of elements in the compound,
D
ratio of neutrons to protons in each element.

Groups of organisms with low biotic potential, such as gray whales, that produce at most one offspring every other year a) are r-selected b) are k-selected c) are not subject to density-dependent limiting factors d) show the initial stages of the extinction process e) have escaped from the processes of natural selection and adaptation

The response is the basis for vaccination. primary secondary tertiary none of the above

Can someone i have no idea of how to do this.