Control procedure to stop rapid switching between alternatives in a concurrent schedule (by imposing a minimal period of time after a switch before a response is reinforced) is called

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Competition occurs between species when

Will mark branliest. the theory of plate tectonics was developed with the contribution of scientists from many different disciplines. which of the following is a contribution from geophysicists?