The geography of the Earth is the result of millions of years of plate movement, which in turn are driven by the heating and cooling cycle of
materials near the Earth's core. Which of the following interactions
between plates explains how a rift valley forms?

all of the above

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.