Smooth endoplasmic reticulum:.1) Smooth endoplasmic reticulum stores calcium ions in muscle cells. 2) Is the major site of carbohydrate synthesis in eukaryotic cells. 3) Produces proteins for cell membranes. 4) Helps assemble ribosomes for protein synthesis.

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Explanation:

I learned this last semester

the pic attached shows the stages of mitosis. hope it !

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.