4. Which relationship is an example of commensalism? A. An oxpecker bird eating insects off the back of a rhinoceros
B. The clownfish living in a sea anemone
C. Tapeworms living in a human
D. Moss growing higher on a tree to gain nutrients and sunlight.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

idk what happened..you tell