How does the soils nitrogen content increase over time?

Twind is considered to be an abiotic factor because it.?

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).

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?