does every organism have blood?

Question

is this a good example of how we all come from one common ancestor?

Answer 1

not all creatures have blood, jellyfish for instance.

Answer 2

Most organisms do NOT have blood. As others have pointed out, bacteria, plants, "lower" animals etc. do not have blood. If you're looking for a good example of common ancestry, think about things that are more common to all organisms. More common than blood is hemoglobin. Hemoglobin can be found in many organisms without blood. If you look at the hemoglobin genes of different organisms, you can determine evolutionary relationships based on the differences in the genes: the fewer differences (human and chimpanzee hemoglobin is virtually identical), the more closely related the organisms are, while greater differences in hemoglobin correspond to greater evolutionary distance (human vs. fruit fly).

Still, not all organisms have hemoglobin. You can look at even more ancient genes such as those involved in DNA replication, transcription and translation, to get a better picture of how organisms have evolved from a common ancestor. The best argument for common ancestry, however, is probably that the genetic code itself is almost identical for every organism. What are the chances that humans would share the same genetic code as a pine tree, a lobster, a yeast cell and a bacterium had they all come from different ancestors? The chance of this happening by coincidence is so small that it is essentially zero.

Answer 3

Arn't plants organisms?

And what about molluscs which have copper based blood that is green?

Blood is actually a rather advanced bodily organ. Perhaps you can say all animals with hemoglobin based blood have a common ancestor. I'm not sure its so. Well...how far back ar you going.

Its better to say every organism has a cell nucleus.

Answer 4

organism refers to a living thing which includes bacteria so no not all things have blood. Im not even sure that fish have blood. Its not a good example of how we all come from a common ancestor. If you mean people by "all" then all of us standing upright and having vocal cords that can cause speech patterns are good examples

Answer 5

No, not all organisms have blood. Some have a blood-like sustance, but I can't remember what it's called. Guess I should have paid more attention in that class.

Answer 6

No, bacteria and protozoa have no need for a circulatory system nor do may higher organisms such as the starfish or the jellyfish.

Answer 7

No not every organism has blood. There are a few different types of circulatory systems.

Answer 8

no, not all organisms have blood. kingdom Animalia is divided into two categories: Chordata and non- choradata.
Non-chordates include microbes like: bacteria, paramecium etc. It also includes insects, molluscs like snail, mussels etc. , other animals like centipedes . millipedes etc. then Echinoderms like: satr fish etc. ALL THESE HAVE BODY FLUIDS BUT NOT RED BLOOD.

Then we come to Higher animals like:
Fishes, Reptiles (: like snake. crocodile etc.)
, Amphibians (like frog, toad) Birds , and Mammals ( like: man, cow , lion , cat etc.)

Most of these but not all have RED blood.

Blood is no clue to common ancestry but there are other clues in emryonic stages of higher animals that hint we have something in common .

Answer 9

Not every organism, most members of the kingdom Animalia however do (multi cellular organisms and such).

Answer 10

trees dont have blood

You can say people came from fish, and insects came from arthopoda. I am speaking about hundreds of millions of years ago, but basically mammals started as fish.

Answer 11

No, even bacteria is considered an organism, yet they are so microscopic.