Which of the following would be a reason for a species to undergo cyclic population changes?
a. the keystone species in its ecosystem is removed.
b. the vegetation it eats increases and then decreases repeatedly with changing seasons.
c. its predator is preyed upon by a new species introduced to the ecosystem.
d. climate change alters the prevalence of parasites that affect the species.

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).

What is the difference between an igneous, sedimentary and metamorphic rock

What is the next step in muscle contraction after the actin changes shape? (apex)