Which scientific term or fact correctly completes this statement: The SI unit of pressure is the?

Which scientific term or fact correctly completes this statement: Red blood cells mainly transport?

The force pulling objects toward Earth is?

Which option correctly completes this scientific statement: Most weather occurs in the ___

Which scientific term or fact correctly completes this statement: Photosynthesis mainly occurs in the?

Which scientific term or fact correctly completes this statement: The kidney's functional unit is the?

Which scientific term or fact correctly completes this statement: The symbol for oxygen is?