I believe it would be a fossil of a reptile but I'm not a 100% sure about it.
Answer:
b.sedimentary rock
Explanation:
because when magma cools it hardens
Answer: D is right
Explanation: It seems both waves have same wavelength.
Because speed = wavelength · frequency (v = λf) and
f = v/λ, so frequency is same. Because period T = 1/ frequency, also periods are same. Wave Y has higher amplidude and its energy is greater.