How can we use rocks to determine how an area use to look in the past?

Could someone me with number one you

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

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.