Weather conditions all over the world during an el niño year is unusual. many rain clouds forms over this warm part of the pacific ocean, bringing more than usual in north and south america. meanwhile, other parts of the world suffer severe
a) rain; drought
b) cyclones; tropical storms
c) rain; drops in temperature
d) days without precipitation; flooding

no i don't feel that humans have oversubscribed some medications

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.