If the level of 67Ha in recent sediment is 0.80 Bq per gram, and a sample of older sedimentary rock shows a Bq level of 0.20 Bq per gram. How old is the sedimentary rock?

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles