The gross primary productivity of an ecosystem is 3.5 kgC/m^2/year and the energy needed by the producers for their own respiration is 3 kgC/m^2/year. What is the net primary productivity of such an ecosystem

The resting potential of a neuron refers to a. the electrical polarization of the inside and outside of the neural membrane. b. a brief electrical charge that travels down the axon. c. a capacity to reabsorb neurotransmitter molecules released into the synaptic gap. d. the storage of neurotransmitter molecules within synaptic vesicles.

Free points + free ! if answered correctly which of these is not a good tip for passing? a. make sure you are on an area of road where it is legal and safe to pass. b. always drive at a safe speed at or below the speed limit. c. you may reduce your following distance below four seconds when passing. d. make sure there is a safe gap in traffic before you change lanes.

Which area of the mind works based on the reality principle? id ego superego conscience