When does the greatest difference in the heights of high and low tides occur?

How do you transfer mrna into codons ? i'm so confused : (

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?