What is emigration?
a. when animals move into an ecosystem
b. when animals die in an ecosystem
c. when animals leave an ecosystem
d. when animals are born in an ecosystem

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. label the following topographic map. click on a label below the map to select it, and then click on the appropriate box on the map to place the label. (increments for contour lines is 50 ft).