(Q).
Q: The frequency of a wave is the reciprocal of what other attribute of the wave? Choices: - amplitude - length - term - period A:
(A).
period

(Q).
Q: Molds and casts usually form in which type of rock? Choices: - igneous - metamorphic - crystalline - sedimentary A:
(A).
sedimentary

(Q).
Q: In mammals, the cells on the exterior form the trophectoderm, which goes on to form what? Choices: - protoplanetary tissues - aeroponics tissues - cardiac tissues - extraembryonic tissues A:
(A).
extraembryonic tissues