An organic compound consists of which of the following elements? a. carbon b. helium c. potassium d. all of the above

Which of the following would most likely be key to gathering evidence that the rna world hypothesis is valid? creation of suitable environments for long-term study of single-celled organisms simulation of early earth conditions and long-term study of the resulting molecules development of a system for studying the microsphere's ability to absorb additional molecules categorization of the different specific conditions that result in the development of microspheres

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

What is the difference between an igneous, sedimentary and metamorphic rock