If R=red-eyed and r= white-eyed, what would be the cross between a white-eyed female (Xr Xr) and a red-eyed male (XR Y)? A. 100% red-eyed females
B. 100% white-eyed males
C. both a and b are correct ​

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

the endomembrane system i think

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.