
Concept explainers
To review:
The life-history attribute that was likely to be present in the common ancestor of the apicomplexans but, not in other alveolates.
Introduction:
The unicellular organisms with alveoli-like sacs beneath their cell membranes are called as alveolates. Alveolate clades mainly include the

Explanation of Solution
Apicomplexans mainly constitute genus including Plasmodium, Theileria, and Toxoplasma. All these organisms commonly have an exclusively parasitic lifestyle. Thus, it is likely to be a characteristic feature of their common ancestor as well.
It can also be noticed that the host of each of the apicomplexans is a mammal, though it is relatively different from the host of each other. Hence, it is justified to claim that the common ancestor of apicomplexans likely had a mammalian host.
Therefore, it can be concluded that unlike other alveolates, parasitic lifestyle and mammalian host are suitably appropriate for the common ancestor of apicomplexans.
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Chapter 26 Solutions
Life: The Science of Biology
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