Which mineral will scratch a knife but not a nail?

Immature bone cells, or osteoblasts, manufacture a protein called osteoid as well as several hormones. because of this, we would expect osteoblasts to contain numerous a) nuclei. b) ribosomes. c) lysosomes. d) golgi bodies.

What methods do scientists use to predict volcanic eruptions? select all that apply

Awarm front often brings a. cirrus clouds b. fair conditions c. cool weather d. steady rain