Which trophic level receives the least amount of energy?

The asian shore crab (hemigrapsus sanguineus) is an invasive species that has impacted the atlantic coast. predict what characteristic of this invader would most likely disrupt the biodiversity of this area.

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?