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Biology 12 Online
gabriel6969:

In an eight–cell embryo of an organism, the cells of the upper tier are aligned directly over the cells of the lower tier. Which organism is it likely to be?

theDeviliscoming:

The organism described most likely is a starfish. This is because annelids and mollusks exhibit spiral holoblastic cleavage while the echinoderms have radial holoblastic cleavage.

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