There are 4 different variations of nucleotides (four different bases),what are the names of those bases?

Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes