I believe the answer is E) Input
The invading bullfrogs ARE HARMFUL. This is because, they cause decline in the population of the native species.
Decline in the population of the native species will throw the ecosystem into a condition of imbalance which will eventually affect all the living organisms that are living in that ecosystem.
Carbon is an essential to all living forms on earth, whether they need carbon intake to help produce food or release carbon for breathing. All plants and animal life need carbon, without it would be impossible for life on earth.
Bio tic Factors. An ecosystem is a community of organisms that interact with each other and with the and biotic factors in their environment. Abiotic factors are chemical and physical factors such as temperature, soil composition, and climate, along with the amount of sunlight, salinity, and pH.
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FaithRawlins14