Species interact in many ways: 

Predation - one species (predator) preys on another species (prey).

Parasitism - symbiotic relationship between species where one species benefits at the expense of the other.

Mutualism - a positive symbiotic relationship where both species benefit.

Commensalism - a relationship between species where one benefits and the other remains unaffected. 

Batesian mimicry and Mullerian mimicry are easily confused. Batesian mimicry involves one organism taking on physical characteristics of a commonly known, dangerous organism. Mullerian mimicry happens when multiple poisonous species resemble each other.

Camouflage helps prey avoid predators by blending into their surroundings. Warning coloration is similar to Batesian mimicry. Since many poisonous organisms exhibit colorful exteriors, some non poisonous organisms can also be brightly colored and are still avoided.

The correct answer choice is biodiversity. Biodiversity is the area within biology focused on understanding biological diversity. The terms "disturbance" and "fragmentation" are natural processes that can have impacts on species, but they do not describe species. The terms "biomagnification" and "bioaccumulation" describe how nutrients and contaminants accumulate over time. 

The correct response is indicator species. If the indicator species is healthy, then it tells or indicates that the ecosystem as a whole is healthy. Indigenous species are native to a certain location, while invasive species are those that are not native to a location and their introduction usually causes harm to the existing ecosystem. A keystone species is one that plays a critical role in the overall health of an ecosystem.

Olfaction in fish and other marine life is very important. Smells are carried on currents and can be used to identify and find prey, recognize familiar territory, attract mates, and warn predators and/or competitors of defense mechanisms.

Somewhere between 40% and 75% of all species are indigenous to rainforests, meaning that they are found nowhere else on earth. They contain half of the extant animal and plant species currently on earth, with a large majority of all flowering plants found there. Many of the world's natural medicines have been found in tropical rainforests, and with thousands of undiscovered species still lurking within them, it is likely that there are many more medicines waiting to be discovered.

In relationships based upon commensalism, one of the species benefits greatly, while the other is neither harmed nor helped. This is different from mutualism, where both species are benefited, and parasitism, where one species is benefited and the other is hindered. "Endosymbiosis" is the theory used to describe how mitochondria developed, and "predation" describes a situation where one organism feeds on another.

Top predators will generally never "grow unchecked". By the very nature of their diet (dependent on other populations), predator population growth is limited by the availability of their food. The famous study of lynx-hare population fluctuations demonstrates how a predator population will adjust to lower prey populations.

Heavy decomposition of plant and animal matter contribute to highly acidic soil in tropical rainforests. Additionally, abundance of plant life in tropical rainforests results in "soil leaching," which means that the nutrients in the soil are drained and taken up by the plants themselves.

Boreal forests have extremely low temperatures and are characterized by pines and other evergreens. "Temperate forests" are characterized by moderate and more fluctuating temperatures, whereas the taiga stays cold year round. Taiga is found in parts of the world such as Northern Alaska, Canada, and Siberia.