An Organism is the correct answer. It has multiple elements such as H2O or CO2
I think B is the correct answer. Answer choices C & D are about dolphins, but they do not have anything related to negative effects surrounding human and dolphin interaction. A, on the other hand, may seem like a good choice, but then again, the answer is too vague.
Naturally ocurring, solid,inorganic, Crystal shape, and definite chemical composition.
Answer:
A scale and a tape measure.
Explanation:
Use the tape measure to get the volume and the scale to get the mass.
