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animals that have no spinal column.

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Chicken or egg formed first

... for some hundred million years, which is evolved from reptiles, digging the phylogeny from reptiles shows following order amphibians, fishes, invertebrates finally prokaryotes. Up to invertebrate has egg laying capability. If we considering the question egg or chicken formed first, we can ...

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by josem
Thu Jul 17, 2014 7:14 pm
Forum: Evolution
Topic: Chicken or egg formed first
Replies: 3
Views: 462

centrifugation of hemocytes

Hello everyone, A simple question, but i'm fed up with this. I work with hemocytes of a invertebrates. Many articles perform centrifugation steps after collecting the hemolymph, whether in eppenddorf, whether directly on a 96-well plate. Theses cells are circulating ...

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by Thom
Mon Jan 27, 2014 6:41 pm
Forum: Cell Biology
Topic: centrifugation of hemocytes
Replies: 5
Views: 2601

How do cockroaches and mosquitoes know the difference betwee

... or not.. Indeed, eyes can be used for both perception of forms and intensity of ligth (and thus perception of a light or dark environment) but invertebrates can also have specific receptors for the intensity of light. From this post http://www.macrostylis.com/en/articles/item/82-polychaetes-and-their-photoreceptors.html ...

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by dgm
Mon Nov 04, 2013 1:33 pm
Forum: General Discussion
Topic: How do cockroaches and mosquitoes know the difference betwee
Replies: 2
Views: 1097

Re: 5 best proofs of evolution

... skeletal structure featuring a backbone and skull. We call these animals vertebrates. Most animals do not have these features (we call them invertebrates). The distinction between vertebrates and invertebrates is something no one who cares to look at samples of both can reasonably deny, ...

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by Raven7899
Sun May 27, 2012 11:46 am
Forum: Evolution
Topic: 5 best proofs of evolution
Replies: 170
Views: 242515

Re: Theories - Origin of Life

... the fossil record, there are "imperfections," and I will attempt to explain some examples of them. The earliest metazoans (animals) were invertebrates - soft-bodied, mostly boneless animals. It is true that there are many missing links - missing fossils of 'common ancestors' - between ...

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by awkko808
Mon Dec 19, 2011 12:38 am
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 907161
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