Spinach is often touted as being a good source of iron and calcium but, truth be told, the human body can't actually absorb most of the calcium and iron because spinach contains that binds up with minerals preventing absorption.

The correct answer is - oxalic acid.

Explanation:

Oxalic acid and phytic acid are also components found in the foods like spinach. These components of the spinach reduce the bioavailability of the calcium and iron present in these leafy food sources.

Oxalic acids inhibit the absorption of calcium by bind to minerals, calcium, or iron and make mineral oxalate, in the gut, and prevent the body from absorbing them.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

it's the cell cycle, but cytokines is when the cell divides.

theres 3 stages interphase,mitosis,and cytokines.

interphase prepares the cell for division.

mitosis is the process of dividing the cell,it has 4 parts interphase,anaphase,metaphase,and telophase.

lastly there's cytokines,that's when the cell divides into 2 daughter cells