Provide 2 reasons that support a balance, or homeostatsis, of nitrogen compounds in an ecosystem.

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?

Involving transcription and translaton. explain the causes and effects of damage to the genetic code.