Answer:
Do you know what the Law of Conservation of mass says? Matter is neither created nor destroyed. Therefore, you have started with 12.7 g Cu and 3.2 g S on the left for a total of 15.9 g; therefore, you must obtain 15.9 g of product(s). If Cu2S is the only product there must be 15.9 g Cu2S.
Answer:
Traits like white eye color in fruit flies are linked to the X chromosome.
Why:
Thomas Hunt Morgan was a scientist, he worked with Drosohilla and studied the sex chromosomes in fruit flies. In the course of his study he discovered that the white eye colour is recessive compared to the dominant red eye colour in the flies and that the white eye color gene is linked to the X sex chromosomes.
I think it’s C, cooling and hardening, but I might be wrong. If it’s wrong then I’m sorry.
You can google it and see what the meaning is and think about what real life examples are for it
