Which of the following describes a potential ecosystem response to climate change?

• A. It has no effect on ecosystems
• B. It can shift species ranges, cause timing mismatches in reproduction, and disrupt energy flow
• C. It causes instant extinction of all species
• D. It only affects marine systems

Answer: (B)

When climate changes, ecosystems respond in interconnected ways. Warming and altered precipitation change where species can live, when they breed, and how energy moves through the food web. This means you can see shifts in species ranges as organisms track suitable temperatures, timing mismatches when life cycle events no longer line up with resource peaks, and disruptions to energy flow as changes in productivity ripple through herbivores and predators. For example, warmer oceans can stress corals and alter reef energy dynamics, while forest pests may outbreak more with milder winters, changing energy transfer through those systems. The option describing these potential responses—shifts in ranges, mismatches in reproduction timing, and disrupted energy flow—best captures how climate change can affect ecosystems. The other statements don’t fit because climate change does have broad effects, it does not instantly cause extinction of all species, and it impacts both land and sea, not just one domain.