This is showing all the steps
<span>Land snails, semi-slugs and slugs are important players in the forest decomposition process and contribute to the nutrification of soils through their decaying bodies, shells and faeces. Their dead shells can form an important source of calcium for other animals in calcium-poor habitats.</span>
<u>" D is correct answer."</u> Macromolecules its describes both collagen and hemoglobin." "Hope this helps!" "Have a great day!" "Thank you for posting your questions!"