What is expected to happen to the number of people sixty years and older in the developed world by the year 2050? to what can this be attributed? (site 1)

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

Look at the photo of the leaf. which term best describes this leaf?

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.