Producers are the group of organisms which are capable of using energy from the sun to produce their own food. All the other living organisms depend on the food produce by producers to survive. Both animals and humans feed on the plants and humans also eat animals which feed on plants.
Without producers, there will not be any food in the world for other living organism to eat and survive.
Tarsiers I believe is the correct answer.
The way in which humans are altering the envrionment is one of the main reasons why pathogens move from one species to another. The emergence of hemorrhagic fever in Argentina is an example of how human change to the environment has caused a cross-species transfer.
You could also say that the neutron is the odd man out because the number of protons and electrons are the same because the negative charge from the electronics attracted to the positive charge from the proton.
On the next line you could say the election is the odd man out because the protons and neutrons reside in the nucleus and the electrons fly at high speeds in the electron cloud.