Phytoplankton contribute to the ocean's ecosystem by producing oxygen through photosynthesis and forming the base of the marine food chain, supporting various marine life.

Behaviors enhance survival in animals by enabling them to find food, evade predators, attract mates, and adapt to changing environments, ultimately increasing their chances of reproduction and long-term survival.

Energy transfer between trophic levels in food chains is represented by arrows, showing the flow of energy from one organism to the next, with energy decreasing as it moves up the chain.

Certain genes are activated or repressed in response to signals from the environment, developmental stages, or cellular conditions, often through regulatory mechanisms like transcription factors or epigenetic modifications.

Migratory birds typically return to their breeding grounds in the spring, as warmer temperatures and longer daylight hours signal the start of the breeding season.