Define hydroelectric power

What type of specimens where you able to see under each of the microscopes in the microscope activity

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.