(D) The eggs of cockroaches $(Periplaneta \text{ } americana)$ are $centrolecithal$. In $centrolecithal$ eggs, the yolk is concentrated in the center

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(D) The eggs of cockroaches $(Periplaneta \text{ } americana)$ are $centrolecithal$. In $centrolecithal$ eggs, the yolk is concentrated in the center of the egg, and the cytoplasm is restricted to the peripheral layer. This type of egg is characteristic of most insects.