how do chemical weathering, gas exchange, and limestone formation help marine organisms thrive? select all…

how do chemical weathering, gas exchange, and limestone formation help marine organisms thrive? select all that apply.\nthe process of limestone formation releases large amounts of carbon into the oceans and atmosphere as the caco₃-based shells of marine organisms dissolve.\nwhen rocks on land undergo chemical weathering, runoff delivers ca²⁺ ions to the oceans. marine organisms can use those ions to build their shells and exoskeletons.\nshell-building marine organisms rely on co₃²⁻ ions, which can be produced through the breakdown of h₂co₃ from gas exchange or of hco₃⁻ ions from runoff.\ngas exchange helps regulate ocean chemistry by continuously moving ca²⁺ and hco₃⁻ ions between the atmosphere and ocean water.

how do chemical weathering, gas exchange, and limestone formation help marine organisms thrive? select all that apply.\nthe process of limestone formation releases large amounts of carbon into the oceans and atmosphere as the caco₃-based shells of marine organisms dissolve.\nwhen rocks on land undergo chemical weathering, runoff delivers ca²⁺ ions to the oceans. marine organisms can use those ions to build their shells and exoskeletons.\nshell-building marine organisms rely on co₃²⁻ ions, which can be produced through the breakdown of h₂co₃ from gas exchange or of hco₃⁻ ions from runoff.\ngas exchange helps regulate ocean chemistry by continuously moving ca²⁺ and hco₃⁻ ions between the atmosphere and ocean water.

Answer

Brief Explanations:

To determine the correct options, we analyze each statement:

  1. Limestone formation (dissolution of ( \text{CaCO}_3 ) shells) releasing carbon: Marine organisms' shells dissolving releases carbon, but this doesn't directly help them thrive (it's more about carbon cycling, not organismal benefit). So this is incorrect.
  2. Chemical weathering runoff delivering ( \text{Ca}^{2+} ): Marine organisms use ( \text{Ca}^{2+} ) to build shells/exoskeletons, which is essential for their survival. Correct.
  3. ( \text{CO}_3^{2-} ) for shell - building: Shell - building organisms need ( \text{CO}_3^{2-} ), and it can be produced from ( \text{H}_2\text{CO}_3 ) (from gas exchange) or ( \text{HCO}_3^- ) (from runoff). This provides the necessary ions for shell construction, helping them thrive. Correct.
  4. Gas exchange moving ( \text{Ca}^{2+} ) and ( \text{HCO}_3^- ): Gas exchange involves ( \text{CO}_2 ) (not ( \text{Ca}^{2+} ) or ( \text{HCO}_3^- ) directly moving between atmosphere and ocean in the way described). So this is incorrect.

So the correct options are the second and third statements (the ones with checkmarks for the correct reasons and the first and fourth are incorrect). But based on the initial checkmarks in the image (assuming we are to confirm the correct ones), the correct options are:

  • When rocks on land undergo chemical weathering, runoff delivers ( \text{Ca}^{2+} ) ions to the oceans. Marine organisms can use those ions to build their shells and exoskeletons.
  • Shell - building marine organisms rely on ( \text{CO}_3^{2-} ) ions, which can be produced through the breakdown of ( \text{H}_2\text{CO}_3 ) from gas exchange or of ( \text{HCO}_3^- ) ions from runoff.

Answer:

  • When rocks on land undergo chemical weathering, runoff delivers ( \text{Ca}^{2+} ) ions to the oceans. Marine organisms can use those ions to build their shells and exoskeletons.
  • Shell - building marine organisms rely on ( \text{CO}_3^{2-} ) ions, which can be produced through the breakdown of ( \text{H}_2\text{CO}_3 ) from gas exchange or of ( \text{HCO}_3^- ) ions from runoff.