(Please help ASAP I will mark brainliest!! (: )Which of the following describes what happens when a cell uses energy to transport something across the cell membrane? 1.osmosis
2.diffusion
3.passive transport
4.active transport

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

What is the mass of oxygen gas is consumed in a reaction that produces 4.60mol so2