How do phospholipids interact with water molecules?
a. phospholipids do not interact with water because water is polar and lipids are nonpolar.
b. the polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract).
c. phospholipids dissolve in water.
d. the polar heads interact with water; the nonpolar tails do not.

A1 a 2 a 3 ooh lol i think that's it

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

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