Given that bacteria can reproduce very quickly , what prevents them from overpopulating the world ; explain

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

List two modern organisms that have pentameral symmetry

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.