An endothermic organism is

• A. Grasshopper
• B. Hydra
• C. Earthworm
• D. Blue jay
• E. Frog

An endothermic organism is one that can regulate its body temperature internally, often referred to as warm-blooded. Among the options provided, the correct answer is:

Answer: D. Blue jay

Here's a brief overview of the options:

• Grasshopper: This is an ectothermic organism, relying on external sources for heat.
• Hydra: A simple aquatic organism that is also ectothermic.
• Earthworm: This creature is ectothermic, depending on the environment for temperature regulation.
• Blue jay: A bird that maintains a constant body temperature, making it endothermic.
• Frog: Generally ectothermic, as it relies on the environment for warmth.

In summary, the blue jay is the only endothermic organism in this list, capable of maintaining its body temperature regardless of the surrounding environment.