Checked content

File:Ancestors.gif

Ancestors.gif ‎(347 × 246 pixels, file size: 8.63 MB, MIME type: image/gif, looped, 438 frames, 31 s)

Description & Sources

Continuity and derivations of life forms between sponge and human male.

  • Orientation : Inside / outside. First stage of polycellular organism.

  • Animation and coordination : Invention of muscle and nervous cells. Mouth and stomach.

  • Swimming worm. Bilateral symmetry. Segmentation. First internal organs.

  • Primitive Cephalochordata, formation of the spine. Differentiation of internal organs.

  • Skull (with eye) and spine is complete. Vertebrata : the nervous system is complete.

  • Formation of the Jaw. - Differentiation of fins. Chondrichthyes stage

  • Typical fish - Invention of bones and scales, the fins have complex musculation and articulations. The lateral fins will evolve to become limbs.

  • The fins evolve to fleshy members. Apparition or differentiation of lungs? First land movements?

  • Formation of the neck. Fingers appear - movement and prehension ability.

  • Land conquest. Lungs are functional, but the animal is still water-dependent for reproduction. (this one should be a salamander, not a lizard, but the general outlook is OK)

  • Dry skin and water-independence of Amniote. (this one should be a lizard, not a salamander, but the general outlook is OK)

  • Hair and gestation invention. Primitive mammalia are but insect-eaters "hairy lizards"... this one's cute, isen't it?

  • Living in trees, our ancestors gained an opposable thumb and binocular frontal vision.

  • (I needed an intermediary picture for smoother transition, so...) Higher monkey - social interaction and communication probably increased at that time. Ability to awkwardly walk on two feet.

  • (I needed yet another intermediary picture for smoother transition, sorry) Our nearest cousin - lost its tail, by the way.

  • Vertical position frees the brain and the hand.

Summary

Description Evolution line from sponge to man
Date 1 January 2007
Source Own work
Author Michelet-密是力 ( talk)

Licensing

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

w:en:Creative Commons
attribution share alike		 This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.
You may select the license of your choice.
The following pages on Schools Wikipedia link to this image (list may be incomplete):

Schools Wikipedia facts

All five editions of Schools Wikipedia were compiled by SOS Childrens Villages. SOS Childrens Villages is famous for the love and shelter it brings to lone children, but we also support families in the areas around our Children's Villages, helping those who need us the most. Will you help another child today?