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Intraspecific competition is an interaction in population ecology where members of the same species compete for limited resources such as food, water, territory, or space. Worker and soldier termites belong to the same species (within a single colony), and their competition for space or resources in a confined environment is a classic example of this phenomenon.

Plants adapted to hot, dry environments (known as xerophytes or succulents) often store water in specialized tissues to survive periods of drought. This water is typically stored in large parenchyma cells, which are found in fleshy stems, leaves, or roots. These storage tissues allow the plant to maintain its metabolic processes when water is scarce in the soil. Producing many leaves would increase the surface area available for transpiration, leading to rapid water loss and dehydration in hot, dry conditions. Stomata are the primary sites for water vapour to exit the plant. Having many stomata would accelerate water loss; instead, desert plants usually have fewer stomata to conserve moisture. While some evergreen plants are drought-tolerant, "evergreen" simply means the plant retains its leaves year-round. In extreme hot and dry conditions, many plants actually shed their leaves (deciduous behavior) to reduce water loss rather than keeping them.

Rodents gnaw on food with their chisel-like front teeth. These specialized, ever-growing incisors are designed for cutting, biting, and gnawing, often growing continuously throughout their lives to prevent being worn away. For example, rats, mice, squirrels, and beavers use these sharp front teeth to eat nuts, fruits, and seeds.

The spots (rosettes) of a leopard and the stripes of a tiger are classic examples of disruptive colouration. This is a form of camouflage that uses high-contrast patterns to break up the outline of an animal's body. By visually "shattering" the animal's silhouette, these patterns make it difficult for prey to recognize the characteristic shape of a predator against a complex background of tall grass or dappled forest shadows. Cryptic colouration: While disruptive colouration is technically a type of crypsis (camouflage), "disruptive colouration" is the more specific and scientifically accurate term for patterns like spots and stripes that break up a silhouette. Warning colouration involves bright, conspicuous colours (like those of a poison dart frog or monarch butterfly) used to signal to predators that the animal is toxic or dangerous. Leopards and tigers use their patterns to hide, not to be seen. Counter shading refers to a colour pattern where an animal is darker on top and lighter on the bottom (like a shark or a penguin) to counteract the effects of overhead light and self-shadowing. While leopards do have lighter underbellies, their defining spots and stripes are not examples of this specific mechanism.

Palaeontology is the scientific study of life of the geologic past through the analysis of plant and animal fossils. It provides the most direct and best evidence of the relationship between living organisms and their extinct relatives because fossils serve as a physical record of extinct species, allowing scientists to document their existence and trace transitions between ancient and modern organisms. The study of the relationship between living organisms and their extinct relatives relies on evidence from paleontology, specifically the fossil record, and other fields like comparative anatomy and molecular biology. Fossils document the existence of extinct species, providing insights into their ancestry and relationships with extant organisms.

Most plants cannot move away from stimuli. While some plants exhibit movement in response to stimuli (a phenomenon known as tropism), this is not a characteristic most plants possess. Respiration, reproduction, and adaptation to the environment are all fundamental characteristics of plants.

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