Why is there a limit to the number of levels that a food chain can reach?

Which of the following is a common danger of commercial fishing?

Asap i will reward you brainliest for best which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.

The cluster of developing cells from conception until birth is called an