When did the worldwide response to ozone depletion begin? select one: a. 1940s and 1950s b. 1960s and 1970s c. 1970s and 1980s d. 1980s and 1990s

Why are fossils of organism's from the phanerozoic eon much more likely to be found than fossils of organisms from any other eon? a. more organisms present during the phanerozoic eon had soft body parts. b. organisms present during the phanerozoic eon were all microscopic. c. more organisms present during the phanerozoic eon had hard body parts. d. organisms present during the phanerozoic eon are the most ancient life forms.

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

In the developed world, women are increasingly more likely to delay childbirth until their mid- to late- twenties or long because