What process would you consider essential for maintaining life ?​

24. how are vaccines used to keep people healthy?

Which of your fossils are most likely heterotrophs? which of them are autotrophs? how do you know?

3. draw a topographic map that displays the following features: (4 points each) a. the contour interval is 20 meters. b. the point of lowest elevation is 960 meters. c. the point of highest elevation is 990meters. d. there is at least one sinkhole or depression, at any elevation. e. there is at least one steep slope and one gentle slope.