The pedigree chart represents three generations. Red family members have a disease that is caused by an autosomal dominant gene. Consider the chart. The father in Generation I must have what genotype? D represents the allele for the disease; d the allele for normal.

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?

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while the heads of the phospholipid structure attract water, the tails are hydrophobic. the model shows how the hydrophilic section folds around the fluid molecules to bring them into the cell so they don’t need to pass through the hydrophobic tails.  

b . streams flow into shallow areas.

f . movement of earth’s crust creates low areas that fill with water.