Fungi that decompose dead organisms
a. can cause serious disease in plants.
b. live in symbiosis with other organisms.
c. return important nutrients to the soil.
d. are often called pioneer organisms.

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.