Genetic variation can eventually lead to changes in traits of a population, which can be used to identify an organism.
Dichotomous Key: a dichotomous key can be used to identify organisms by selecting the appropriate option from a series of two alternatives.
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Hibernation: hibernation is a deep sleep during which an animal slows down its body processes to save
energy. It is triggered by external stimuli such as cold, dark conditions.
Migration: migration helps animals to avoid harsh conditions that can come with seasonal changes. It is triggered by external stimuli such as colder conditions or lack of food
Natural Selection & Adaptation: an adaptation is a change by which organisms become better suited to its
environment over time. Natural selection is the process by which organisms better adapted to their
environment tend to survive and produce more offspring.
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Transportation in plants: xylem and phloem are tissues that make up a plants vascular system, which transports water and nutrients to and from cells. Xylem allow water to be drawn up into the plant to
prevent wilting.
Counter-current gas exchange in gills: as the fish swims, water flows over the gills, allowing a constant supply of oxygen.
Adrenaline: Fight or Flight response
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