D Bc I just did it and got it right
        
             
        
        
        
<span>A) bacteria. Membrane-bound organelles are found in eukaryotic cells. However, bacteria are prokaryotic, meaning that they do not have membrane bound organelles.</span>
        
                    
             
        
        
        
I might be wrong but I think C ( what the wave it traveling through). I think C because a wave medium is the substance that carries a wave (or disturbance) from one location to another. The wave medium is not the wave itself and it doesn’t make the wave. It just Carries or transports the wave from its source to other locations.
        
                    
             
        
        
        
Answer:
Question 1. (C. Gravity) Question 2 (A. Stays the same) Question 3. (C. The Sun)
Explanation:
Question 2: I say this because it depends on where the planets are orbiting. Because planets closer to the sun <u>will always</u> have shorter years and and planets farther from the sun <u>will always</u> have longer years.
The other two question Im am 100% positive Im correct. So if someone knows Im correct or incorrect on question 2 please comment the answer below!
(have a great day!)
 
        
             
        
        
        
"A nephron is used to separate water, ions, and small molecules from the blood, filter out wastes and toxins, and return needed molecules to the blood." 
https://biologydictionary.net/nephron/