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3. a phospholipid molecule is and forms hydrogen bonds
4. hydrophilic means a

3 -    phosphate group (head) ;    hydrophilic ;   water and/ or polar substances

4 -    is attracted to water and other polar substances.

Explanation:

Phospholipids have two parts: a hydrophilic head (phosphate group) and hydrophobic tails (fatty acids). Hydrophilic basically means a substance that is attracted to water (Hence, hydro - water and phile - loving), and thus, by virtue, to other polar substances (since water is polar).

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.