Comparative and experimental investigations are two of three scientific investigations, the other is descriptive investigations.
--hope this helps--
Answer:
B
Explanation:
This is the only thing missing in the food chain
Veins would be the correct answer if I am not mistaken
The landscape in which limestone is eroded to form deep valleys and cavers are called Karst landscape or karst topography. This kind of development start occuring whenever the acidic water starts breaking down the bedrocks near the cracks. As the bedrock starts breaking down slowly, the cracks start to open up creating bigger holes. with passage of time the holes will become big enough to create an underground drainage system for the surface water to flow and form underneath. If the water is unable to flow out and becomes stagnant, then the Karst will start getting bigger.
