A heater on the first floor of the school makes the air on the second floor warm. what is it conduction convection or radiation

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

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.

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )