How does a root system work in the desert

The model illustrates a process by which a substance is taken up by a cell

This is the diveristy of ecosystems natural communites and habits it is the variety of ways that species interact with each other and their environment

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13