Coal, as we cannot easily produce more of it.
Smooth ER is responsible for synthesizing/making proteins these DON'T have ribosomes on them like rough ER has. Smooth ER is mainly known for making hormones and lipids. It's also found in both animal and plant cells as well as in eukaryotic cells and NOT prokaryotes. I hope this helps!
<span>Red blood cells are formed in the red bone marrow of bones. Stem cells in the red bone marrow called hemocytoblasts give rise to all of the formed elements in blood. If a hemocytoblast commits to becoming a cell called a proerythroblast, it will develop into a new red blood cell.</span>
