Which two statements are true of mechanical waves? A. They transfer energy by disturbing electric and magnetic fields.
B. They use a medium to transfer energy.
O c. They travel by causing particles of matter to vibrate.
D. They do not need a medium to transfer energy.

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

i think its c if i'm wrong

statement #3 on andre"s list is false.