Active transport can involve the transport of ions requires the cell to expend energy

What type of competition exsist between two species. turtles and fish

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?

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.