Which of the following four statements, if any, is true regarding essential elements and living organisms?
1. the elements carbon, hydrogen, nitrogen, and oxygen make up 20-25% of living mass.
2. given their low concentrations in nature, the toxicity of some elements is generally not a factor in the evolution of biological communities.
3. although all forms of life require iron, other elements are required only by certain species.
4. all organisms require 25 of the 92 naturally occurring elements to survive.
5. all of the listed responses are correct.

what's the question?

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.

answer transpiration;