Nearly 97% of the water on earth is unusable by humans because of its (a. temperature b. salinity c. impurities) . this lack of usability is due to the fact that water ( a. is a universal solvent b. expands upon freezing c. is transparent) .

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.