In diffusion, A) the molecules only move if ATP is present

B) the molecules move from an area of low concentration to high concentration

C) the molecules are unable to permeate the membrane

D) the molecules of a substance spread out evenly in the space they occupy

Often, caries will develop in an area of the tooth that's not readily accessible. which cavity preparation form defines this? a. retention b. resistance c. outline d. convenience

Sydney drew a flow chart to illustrate the nitrogen cycle.which labels best complete the flow chart? x: producers undergo photosynthesis.y: nitrogen compounds are released into the air.x: nitrogen compounds are released into the air.y: producers undergo photosynthesis.x: free nitrogen is in the atmosphere.y: producers absorb nitrogen compounds through their roots.x: producers absorb nitrogen compounds through their roots.y: free nitrogen is in the atmosphere.

2. what process do mrna and trna work together to complete? (3 points)