Answer:
Observers ahead of the wave observe an apparent increase in wave frequency
Explanation:
This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.
B, C, and D are wrong. Observers behind the source notice a decrease in frequency.
Facial expressions, body movement and posture, gestures, eye contact, touch, space, and voice.
Answer:
B
Explanation:
Igneous rocks are formed by the solidification of magma or lava.
Answer:
nonsense mutation
Explanation:
In DNA, the uracil (U) is replaced by thymine (T). If a change in the DNA sequence, or mutation, of a gene occurs that creates a stop codon, this is called a nonsense mutation.