How do bicarbonates influence biotic factors

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.

What is the compliment dna strand to the following sequence: ttgactaggcta

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?