Bird wings and dragonfly wings are both used for flight is it homologous structure or analogous structure

✔ Analogous structure

Bird wings and dragonfly wings are both used for flight.

✔ Homologous structure

Clams and snails both have similar muscle structure even though the muscles do different jobs.

✔ Homologous structure

Human and giraffe necks both have 7 vertebrae because we are related.

✔ Homologous structure

The flaps of a Venus flytrap have a similar makeup to oak leaves.

Analogous. This means they share a similar function (flight) but do not have the same embryonic origin.

I’m not sure I fully understand the question, but all of the examples given are closed systems, where a limited amount of material is available, and is recycled through the system continuously. For example, nutrients that are taken up by a plant are released when that plant dies and decomposes, and can then be taken up by another plant.