Draw the form of L-glutamic acid that predominates at each pH. Include stereochemistry in your answer. Do NOT explicitly draw any hydrogen atoms in your structure or use abbreviations like OMe, COOH or Ph. MUST SHOW STERIOCHEMISTRY (a) pH = 1.9
(b) pH = 2.4
(c) pH = 5.8
(d) pH = 10.4

they are made of gases.

they have a spherical shape.

they make energy through fusion.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.