Part D Changes in ecosystems can be attributed to natural causes, such as natural disasters, seasonal variations
in climate, currents, and tidal activity. Many of these changes can affect the amount of food resources
available in an ecosystem. Research one natural change that currently affects or could affect the aquatic
ecosystem you chose. Use your food web model to explain how this change can affect the competition of
food resources in your aquatic ecosystem.

Need ! will give 20 points! what are two ways that diatoms differ from slime molds? the external coverings of diatoms are made up of (silica, chitin or peptidoglycan), while slime molds have cell walls containing (silica, peptidoglycan or chitin). diatoms are (chemoheterotrophs, photoautotrophs or chemoautotrophs) because they make food through photosynthesis, while slime molds are (heterotrophs, phototrophs or autotrophs) because they eat decaying plant matter.