Question

written by james dauray
http://www.docstoc.com/profile/jamesdauray
embryology
organisms that are closely related may also have physical similarities before they are even born! take a look at the six different embryos below:
source: http://www.starlarvae.org
hypothesize which embryo is from each of the following organisms:

species	embryo

|human|
|chicken|
|rabbit|
|tortoise|
|salamander|
|fish|

Explanation:

This uses principles of comparative embryology, where more distantly related species (like aquatic vs. terrestrial vertebrates) show earlier distinct traits, while closer relatives share more embryonic similarities longer. Fish embryos retain gill structures and a more fin-like tail early. Salamanders (amphibians) have distinct external gill-like features. Tortoises (reptiles) develop a broader head structure. Chickens (birds) have a curved body and specific facial folds. Rabbits (mammals, non-primate) have a rounded head with small, forward-set eye spots. Humans (primates) have a more rounded skull and distinct eye placement early on.

Answer:

Species	Embryo
Chicken	E
Rabbit	D
Tortoise	C
Salamander	B
Fish	A