While elements and compounds are related, they are different. unlike elements, compounds can be described as which of the following?

a) consists of only one type of atom

b) are the smallest form of a particle

c) exists only as pure substances

d) are made of at least two types of matter

plz answer !

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.