which end tell you a anterior end of a amphioxus?
407668
They have mouth openings often with flagellum to help with their filter feeding.  The tail end is thinner and is lighter in color/more transparent.  Just do an image search for amphioxus and see!
1076850
Scientific explanation? The symetry and mass of a frog is designed in such a manor that the mass at the rear of the frog is larger than the mass at the front. Assuming that the mass is of equal density throughout the body of the frog and using newtons law, when the frog propels itself in a skyward trajectory, the end of the frog with the larger mass will fall towards the earth first. This area of mass just happens to be the frogs butt! By the way, what did one frog say to the other? .....................Times fun when your having flies...
611015
http://www.edugraphics.net/gh-human_anatomy/gh235.htm
548575
I think it's the left side. I don't know if this is exactly what you're looking for, but check out the website below.
16277
Here you go:\n\nhttp://www.bsd.sk.ca/~mkozlow/ocean/OctopusandSquid.html#anchor3361022\n\nActually they both have eight ARMS but squids also have 2 tentacles.
433683
Side view could be profile; strip of land is isthmus (strait is actually water)
1174872
The aqueous humor accumulates between the iris-capsule diaphragm and the anterior hyaloid face, an area known as the canal of Petit. The pressure from the aqueous trapped in the posterior chamber displaces the iris forward. This is posterior pupillary block. The block impedes the forward movement of the aqueous to the anterior chamber leading to iris bombé, obstruction of the angle, and possible formation of peripheral anterior synechiae.
1023036
eight. octa= eight (ex: octopus- eight legs, octagon- eight sides)
652387
http://www.oceanlight.com/lightbox.php?sp=Tamiasciurus_douglasii
32854
Fishes, as all other vertebrates, have closed circulatory systems; they have a single blood circuit in which the heart pumps the blood toward the gills where it picks up oxygen, and is then distributed to the body. However, our (human) anatomy is very derived with respect to aquatic pisciform vertebrates. In fishes the circulatory system is very symmetrical and more metameric. The best place to look is the gill area, where the major vessels occur. The heart, which looks like an elongated bulb, is situated ventrally right behind the gill basket. The ventral aorta is the major vessel extending forward below the gills, and emits branches to each functional gill. Once they go through the gill filaments, these vessels reunite dorsally and form the dorsal aorta (paired, then joined). Other vessels are difficult to observe as they usually collapse in dead materials, but if you have fresh large specimens you could try injecting a colored rubber solution (VERY carefully) inside the largest vessel you can find and if the walls are not broken, you will get an internal cast of part of the system. \nAlso look for the dorsal longitudinal vessels that are really close to the vertebrae, passing through the haemal arches.
162063
the end of a cell. It is used for locomotion of the cell
564789
Hepatopancreatic ampulla is what I was tought.. I checked my old anatomy book, and its the same as the Vater.
390773
It's an example of a transition between lobe-finned fish and AMPHIBIAN vertebrates, not reptiles.  \n\n(Well, it is a reptile transition in the sense that it's part of the spectrum between fish and reptiles, but it's also part of the spectrum between fish and birds or fish and mammals, it just seems a bit forced to call it a fish/mammal transition to me.)\n\nMore importantly, it shows exactly the type of features scientists predicted it should have, confirming the most common theory about how vertebrates moved onto land.
93071
www.aquaticecosystems.com
140735
http://sloscience.hypermart.net/Biology/Frog%20Dissection/dorsal%20muscles.htm
577966
Prefix - Chondro meaning - Cartilage\nSuffix - ichthyes meaning  - Fish
131553
most likely fish, or another animal that lives in water, perhaps an early reptile