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What can cause a decrease in calcium absorption is; High Levels of Sodium
<h3>What causes poor calcium absorption?</h3>
Calcium absorption varies by type of food. The absorption of calcium from dairy products and fortified foods is about 30%.
Some compounds in plants like oxalic acid and phytic acid can decrease calcium absorption by forming indigestible salts with calcium, thereby decreasing its absorption.
Now, we can conclude that calcium absorption is decreased by high levels of sodium because excessive salt can interfere with calcium absorption.
Read more about Calcium Absorption at; brainly.com/question/461228
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I think the answer is d. the moon's umbra only covers a small area on earths surface.
