Which of the following features are present at the ecosystem level? a) chemical cycling through the food chain

b) input of solar energy

c) complex interactions between a variety of populations

d) all are features of an ecosystem

e) energy flow that begins at the producer level

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi