How does the washing of hands prevent a societal problem?

a .it keeps water supplies clean.

b. it treat inherited disease.

c. it protect the environment.

d. it reduces the spread of disease.

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils