Convection keeps the earths surface warm
It will be 1 and 2.
This is not biology. This is Science.
Answer: increase in genetic variation
Explanation:
False
their legs were made form the spine of stingrays and they were used to ward of bad storms.
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.