A bone contains carbon-14 is found. If the bone has 25% of c-14 remaining how many half life’s has it gone?

20 brainliest for whoever answers correctly and answers all choose the statements that accurately describe china's "one child policy." china's "one child policy" began as soon as the communists came to power. the "one child policy" was meant to keep the population from reaching 700 million. the "one child policy" was meant to slow china's population growth. the "one child policy" began as a result of the country's war with japan. some people were allowed to have more than one child. the "one child policy" began in 1979. the "one child policy" was most enforced in urban areas. the "one child policy" ended at the start of 2016. china's population is current just under 1 billion people.

According to the united nations refugee agency, more than 2/3 of the world's refugees come from just five countries. which country is not on that list? a) turkey b) myanmar c) afghanistan d) south sudan

What causes the cyclical changes in the appearance of the moon?