Which step of the nitrogen cycle occurs only in aquatic ecosystems? A. Cyanobacteria convert nitrogen into ammonium
B. Soil bacteria convert nitrogen into ammonium
C. Soil bacteria convert ammonium into nitrate
D. Ammonium enters the ecosystem when humans fertilize soil
E. Nitrates enter the ecosystems when humans fertilize soil

Dermal tissue in plants stores 1.extra food 2.transports water and nutrients 3.transports waste materials 4.is similar to epithelial cells in animals

Which event would lead to primary succession of a forest?

The graph shows the amount of global warming happening in different ecosystems. which populations of organisms will likely decline the most as a result of climate change, and why? a.coral reefs because of the loss of the symbiotic algae living within their bodies b.penguin populations because the fish they eat will move into warmer waters c.mountain-dwelling birds because rising sea levels will relocate their food sources d.large cats in the rainforest because of decreased habitat loss for their prey