Https://www3.epa.gov/climatechange/kids/impacts/effects/ecosystems.html
this link might help you
Answer is D.Because phospholipids form the basic structure of a cell membrane
Gravitational force pulls on each unit mass with a constant force resulting in a constant acceleration (an increase in speed of about 10 metres per second every second). ... This is said to be the 'weight' of the object (i.e. the downward force it exerts because gravitational force is acting on it).
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