In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a 

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#Question id: 4572

#Unit 11. Evolution and Behavior

Of the following anatomical structures, which is homologous to the wing of a bird?

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#Question id: 12147

#Unit 10. Ecological Principles

Climax forests

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#Question id: 10509

#Unit 6. System Physiology – Plant

A different type of mechanical obstacle to herbivory is provided by mineral crystals that are present in many plant species, such as silica crystals known as

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#Question id: 8860

#Unit 9. Diversity of Life Forms

A radially symmetrical animal that has two embryonic tissue layers probably belongs to which phylum?

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#Question id: 3441

#Unit 11. Evolution and Behavior

Animals tend to maximize their energy intake-to-expenditure ratio. What is this behavior called?