Write a formal letter to the department of drinking water requesting for maintenance and repair of water pipe connecting the tap which carries water to your house.

This is the number of complete movements of a wave per second.

If the pressure in a gas is doubled while its volume is held constant. true or false

In 1859, charles darwin published the first edition of on the origin of species, which explained his observations of various groups of animals that showed great similarities but minor differences. darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. this idea predicted many future biological findings and became the basis of modern biology. darwin’s explanation for why different species exist is best described as a(n) law. theory. inquiry. hypothesis.