GUYS I NEED HELP PLZZ Which statement does not describe
checkpoints?
O Normal checkpoints assess damage to DNA.
O Defective checkpoints result in the death of the cell.
O Cell checkpoints can fail in mitosis and meiosis.
O Faulty checkpoints may lead to abnormal cell growth.

What occupation did muhammad have before the first revelation

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 can you tell the difference between rough er from smooth er?