with 20 amino acids to choose from, how many different combinations are there for a protein thats 10 amino acids long (please show work)

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.

What are the proteins in connectivity tissues of your foot examples of?