Describe how the mass and the appearance of the feather changed because of the oil. Can Natalia clean off the feather using water? Predict what will happen if Natalia dips feathers covered in oil in either cold water or in hot water.

the dark variety, as they are not visible on the dark tree barks

explanation:

which fault and or fold did you find most difficult to diagram

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.