The diagram below shows part of the nitrogen cycle. Which of the numbered stages involve bacteria?

1 and 3

2 and 4

3 and 4

Aresearcher is studying the science of attractiveness and asks volunteer test subjects to rank what trait they find most attractive in a person what type of variable is the dependent variable in this experiment

Anybody who knows ap biology, can you friend or message me

New york city has 2,181 inhabitants per square mile. the state of alaska has 1.03 inhabitants per square mile. ecologists would say alaska has a low exponential growth population density birth rate carrying capacity