The answer that makes most sense to me is D. We stopped needing to kill whales, yay! :P
Stereoscope. It's like a less powerful microscope
Answer is D cilia are absent in plant cells
The best way to do a observation can be a microscope or by taking notes ,and by , taking pictures or, asking questions about the subject that you and the teacher or you, your teacher and the class is talking about .! Hope this helps ..
Throwing waste in to water, or spilling anything in the water that's not supposed to be in the water
