A woman with color vision married to a man with color vision produces two color-blind sons, two sons with color vision, and four daughters with color vision. After the death of this husband, the woman marries a color-blind man. How would the offspring expected from this second marriage compare with those from the first marriage? Use a Punnett square to help you.

i believe your answer would be c.. : )

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