Give another example of the organization of the human organism that does not involve the brain. Place the examples in order from simplest to most complex.

"a.) well–developed vascular system."

the animal that would be cutest if scaled down to the size of a cat? elephant

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.