Are the open oceans more rich in silica and iron than land?

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

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).

Does anyone know what a poms statement is for biology? i don't know what it is and i have an assignment on it tomorrow, will award the best answer a brainliest!