Mineral x is scratched by a diamond. mineral x

1. has a mohs hardness of 10
2. can't be scratched by a penny
3. is softer than a diamond
4. must be a precious metal

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

What pattern of migration do whales follow?

Mitosis creates two identical daughter cells from one parent cell creates four nonidentical daughter cells from one parent cell is the most common type of reproduction for bacteria is the process by which male and female reproductive cells are created