<span>A polygenic trait is contributed by two or more genes one gene two alleles multiple alleles. True!</span>
Diatoms have cell walls composed of silicon dioxide.
A. silicon dioxide.
Explanation:
this is cheeeeeeeeeeemistry
It makes sense that cell membranes are made of phospholipids because water cant mix in with lipids, so the phospholipids will be able to effectively block out any unwanted water or chemicals suspended in water outside of the cell.
