Which of the following is a limitation of using a model to study something?

The correct answer will be option-2

Explanation:

A model is the simplified visual representation of the complex systems which is used by the scientific communities.

A model can be used to represent very large systems like the solar system and very small models like microscopic things to explain it to the layman.

The model is also used by the scientific researcher to test the hypothesis, therefore, it is very important in the scientific world.

Since it does not help study the systems which prove very dangerous to humanity and the universe, therefore, option-2 is the correct answer

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time