Steel wool (6 grams) + (1 gram)= ?

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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.