Answer:
By sending and detecting chemical messages.
Explanation:
Proteins are the important biomolecules that can also acts as the building block of the body. Proteins are also used for the communication in the living organisms.
In case of Japanese beetles, the female produces the sex attract called pheromones that helps in the mating of the beetles. The male beetles produces a specific protein that helps in detecting the pheromones and send the chemical message to the female beetle for the mating purpose.
Thus, the correct answer is option (d).
