Embryonic development stages of various species, highlighting anatomical changes from early to late stages.

Diagram showing embryonic development stages of fish, salamander, tortoise, chick, rabbit, and human, illustrating anatomical changes from early to late stages.

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Show Answer Key & Explanations Step-by-step solution for: Human evolution

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- Fish: Develops fins and a streamlined body; gill slits become functional gills; tail elongates for swimming.
- Salamander: Limbs form and grow; tail becomes more prominent; gills develop externally before internal lungs mature.
- Tortoise: Limbs develop with webbed feet; shell begins to form over the back; head and neck elongate.
- Chick: Wings and legs develop; beak forms; feathers begin to appear; yolk sac is absorbed.
- Rabbit: Limbs become distinct with paws; fur begins to grow; ears lengthen; eyes open late in development.
- Human: Limbs elongate with fingers and toes; brain and skull expand; facial features become defined; vernix caseosa covers skin.

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