Which trait is found in early embryos of both birds and humans, but then disappears from each during development? soft shell scales tail gill slits

answer; i believe the answer is (polygenic inheritance;

multiplying and dividing the two decimals and the eqations by the same number of the overalls

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this