Why might scientists want to study the size, the density, and the distribution of a population? What can these three metrics tells us about a population?

Is there any solid scientific evidence that humans have been cloned?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

Will give ! ! widentify the advantages and disadvantages of renewable and nonrenewable energy resources.