Each phospholipid molecule consists of two parts :

• a polar head that gives it a property with attracted to water.
• a pair of non-polar tails that give it a property with repelled by water.

How can you approximate the number of calories required to keep you in energy balance?

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are