What is the disadvantage of using models to study the food web? Observations are made from inside the system.
Actual interactions are affected by the models.
They cannot show all the interactions taking place.
They cannot help in making predictions about a population.

and please explain for brainliest.

Which of the following statements is true regarding a basic amino acid? a.) the hydrophilic r group of a basic amino acid will be located on the interior of a protein b.) the positively charged r group of a basic amino acid could bind dna c.) the r group of a basic amino acid would only be able to form covalent bonds with other molecules d.) a basic amino acid would be considered both polar and hydrophobic e.) all of the above