When an astronaut in orbit experiences apparent weightlessness, a. no forces act on the astronaut. b. no gravitational forces act on the astronaut. c. the net gravitational force on the astronaut is zero. d. the net gravitational force on the astronaut is not balanced by a normal force.

After hydrogen and oxygen, witch element makes up almost all of the most common substance in your body

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.

How would you expect the mrna codons that code for the amino acids that make up hemoglobin to compare between humans