Why was iodine able to diffuse across the membrane while starch was not?

The correct reason would be their size difference iodine are small while starch molecules are large to pass through the membrane.

Explanation:

The permeability of the membrane also depends on the size of the molecule. The large molecule can not pass even though all other conditions are in their favor. For example Iodine molecules are small enough to go through the membrane freely, however starch molecules are too large and complex to pass through the membrane.

Thus, The correct reason would be their size difference iodine are small while starch molecules are large to pass through the membrane.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.