A student made a model of a cell. First, she filled a plastic bag with gelatin. Then she added a rubber ball. What are two limitations of the student's cell? A. The model does not show how a real cell gets the energy it needs to live.

B. The model does not show that cells can contain smaller structures inside them.

C. The model is made up of materials that are different from those found in real cells.

D. The model is not as easy to see and hold as a real cell is.

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

protocol for imps extraction focusing on membrane protein extraction, solubilisation, and purification.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )