| 1. | The structure of sirens'reproductive systems suggests they employ external fertilization.
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| 2. | Marine species all lay eggs and use either internal or external fertilization.
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| 3. | Corals reproduce sexually by either internal or external fertilization.
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| 4. | Other animals reproduce sexually with external fertilization, including many mammals copulate vaginally.
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| 5. | Within iteroparous fish, they usually give no parental care with external fertilization.
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| 6. | Most fish however are oviparous and exhibit external fertilization.
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| 7. | Eggs and sperm are released into the water column where external fertilization takes place.
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| 8. | Aquatic species use either internal or external fertilization.
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| 9. | Fish don't have either, and just squirt in the water for external fertilization.
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| 10. | Eggs are released through the exhalent siphon and external fertilization in the water column takes place.
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