I heard insects do not have blood. Not sure about say an octopus or a crustacean.
2006-09-30 17:06:56 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Let us assume that by "animals" you mean all organisms classified in the kingdom Animalia. Let us also assume that by "blood" you mean "fluid contained within a circulatory system."
In this case, there are only six phyla that do not blood: porifera (sponges), cnidara (jellyfish), ctenophora (comb jellies), platyhelminthes (tapeworms), nematoda (hookworms), bryozoa (moss animals).
Animals in all other phyla from mollusca (clams) right on up to chordota (humans) have blood.
Insects do have blood. They are in the phylum arthopoda. Crustaceans are in the phylum mollusca and, therefore, have blood.
2006-09-30 17:28:42 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Any animal that gets too long or thick for oxygen to diffuse directly to all of its cells has to have some way to get the O2 from outside of its body to the entire inside. This size & thickness limit is about the size of a planaria; a kind of flatworm that grows ~ 1/4 inch long & 1/20 inch thick (?). Larger than that either gills or lungs & some kind of circulatory system are needed.
Insects do have blood - a grasshopper has white blood.
Horseshoe crabs have blue blood. I don't know what color the octopus has - depends what it uses to carry the 02. (Horseshoe crabs use copper)
;-)
2006-10-01 00:21:43 · answer #2 · answered by WikiJo 6 · 1⤊ 0⤋
As far as I know insects, octopus, and crustaceans aren't animals, but have you ever slapped a mosquito?
2006-10-01 00:10:21 · answer #3 · answered by alis_n_1derland 5 · 0⤊ 0⤋
All animals and insects have blood. But for few insects, the blood is colourless. It is kind of watery.
2006-10-01 00:11:37 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Every animal has blood however some animals such as octopus etc do not have red coloured blood.
2006-10-01 00:57:03 · answer #5 · answered by ag_iitkgp 7 · 0⤊ 0⤋
all animals have a "blood". all of them. it is not the traditional blood that you and i have, but it is still a fluid substance. animals like sea stars (formerly called star fish) have what is called a hydro-vascular system, where most of their nutrients are muscular movements are moved within the body via water system. but, it's not completely water, but it's not chocked full of red blood cells like ours either. hope that helps.
2006-10-01 00:18:21 · answer #6 · answered by James J 2 · 0⤊ 0⤋
ALL THE ANIMALS HAVE BLOOD
2006-10-01 00:08:34 · answer #7 · answered by chuco 5 · 0⤊ 0⤋
all...
2006-10-01 00:08:50 · answer #8 · answered by intoxicatedturtle 4 · 0⤊ 0⤋