Can someone pls explain and do this solution:(

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

The volume of a box varies directly with its length if a box in the group has a length of 30inches and k=24 what is its volume