The best and most correct answer among the choices provided by your question is the fourth choice or letter D "<span>The thin membrane that closes the cavity of the middle ear from the outside changes position."
</span>Your ears pop in airplanes<span> because the air high above the surface of Earth is less dense than air near the surface, because air near the surface has all the air above it pushing down. </span>Your inner ear has air trapped in it and as the atmospheric pressure changes, it causes pressure on your ear<span>drum.
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Answer:
Separately in Nucleus and cytoplasm,
Simultaneously in the cytoplasm
Explanation:
In eukaryotes transcription and translation occurs separately in the nucleus and cytoplasm respectively. Transcription occurs inside the membrane bound nucleus and the mRNA transcript is transported to the cytoplasm for translation.
In prokaryotes, because prokaryotic cells lack a membrane bound nucleus, transcription and translation occurs simultaneouslyin the cytoplasm. This means that translation of mRNA begins even while the transcription of the transcript is still active.
Answer: 1. a video that shows a large river that has penguin populations on both sides.
Explanation:
Reproductive isolation is a phenomena which occurs when members of the same species becomes separated due to a geographical, physical or behavioral barrier. The members of the same species after separation adapt to changes and this is the basis of speciation or development of new species.
Option 1 is the correct option as the river is the geographical barrier, between the two separated penguin populations.
The U.S. central plains region -- nicknamed Tornado Alley -- suffers the highest frequency of tornadoes in the world [source: Tarbuck]. Many of these twisters leave death, injury and destruction in their wake, but one stands in a class by itself.
Sweeping out from southeastern Missouri on March 18, 1925, the Tri-State Tornado careened across the southern tip of Illinois before dissipating in lower Indiana. Remarkably, these three locales lie 219 miles (352 kilometers) apart, and the tornado traveled this distance in just three and a half hours [source: SEMP].
