A call to action could be a debate or a protest, or even a letter. So long as you're bringing up an issue and resolving it, then I think that would classify as a call to action.
Yes that is correct. All waves have wavelength, frequency, REST POINT, and speed. The FREQUENCY of a wave remains constant if the medium, temperature, and pressure do not change.
Answer:
A
Explanation:
The pronouns "his" or "her" are third person singular. Since the antecedent (fathers and mothers) is plural, it would be more appropriate to change the pronoun to "their".
A short-beaked common dolphin
