In an Antarctic ecosystem, phytoplankton are the main producers. A
species of zooplankton, called krill, are the primary consumers. To some
extent, fish, penguins, seals, whales, and other animals of the ecosystem
depend on krill to survive. Which of these is a biotic factor in this
ecosystem?
A. the amount of ice at any given time
B. che amount of salt in the ocean water
C. the temperature of the air and water
D. the size of the krill population

humans can cause extinction of a species through overharvesting, pollution, habitat destruction, introduction of invasive species (such as new predators and food competitors), overhunting, and other influences. explosive, unsustainable human population growth is an essential cause of the extinction crisis.

explanation:

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air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.