The relationship of two species that can be represented as +/0 would best be described as

The number of living organisms in a particular area is

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

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii