Am The
the contour lines are
together the steeper the slope.
the
The steeper the slope, the
stream's velocity.

what subject is this

substitution is the answer in this case

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive