Which takes place during the second trimester of pregnancy? a. first movements are felt by the mother
b. cerebral hemispheres begin to form
c. fetus makes urine
d. joints and bones form

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

20 the compound al(nh3)2 has atoms of nitrogen.