What organism/s are responsible for nitrogen fixation? Some live in a close relationship with legume plants by inhabiting structures called ?

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

What is the correct term for an area of rotating currents in an ocean? when ocean currents combine, they create an area of rotating currents called an

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.