Using the drop-down menus below, identify the processes cells use to maintain homeostasis. is the movement of water along the concentration gradient.

is the use of energy to move particles against the concentration gradient.

is the movement of particles by diffusion without energy.

is the movement of particles along the concentration gradient.

What factors contribute to the effect an environmental toxin has on the human body?

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

Which diagram best represents the chromosomes that would be found in a two new skin cells produced as a result of this process?