1. step 1 nebular cloud of gas and dust. 2. step 2 3. step 3 4. step 4 other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened, disk. nuclear energy runs out; death, possible supernova condensed material begins to combine and form a core center. as it warms, a protostar is formed. cloud collapses under the force of its own gravitational attraction, usually triggered by a supernova stellar core heats as it grows: nuclear fusion begins and a star is born. 5. step 5 6. step 6

*a mastectomy is the surgical removal of one or both breasts, either partially of fully. an oophorectomy is the surgical removal of an ovary or ovaries.analyze a woman’s risk of dying of cancer if she carries a mutated brc1 gene.how do heredity and inheritance relate to the data presented in these charts? what data would you need to see in order to draw conclusions about the effectiveness of preventive surgeries? what does the age at diagnosis tell you about the mutation? explain how breast-cancer genes are still present in the population, despite cancer-related surgeries and deaths.