Lightning can combine nitrogen with other elements, or be fixed, in order to be used by plants. In what way is most of the fixed nitrogen made available for use by plants?
It is incorporated
into the
exoskeletons of
flying insects that
eat plants,
It is inhaled and
exhaled by birds.
It is carried by rain
to the soil.
It is moved by the
wind toward dry
areas.

Part a - which gene to compare? in this exercise, you will use the cytochrome c oxidase i (coi) gene to investigate relationships among salmon species. (this gene encodes a protein that functions in the mitochondrial electron transport chain.) you will compare the coi gene sequences from your salmon test samples to the standard sequences for each salmon species. in order for the coi gene to be useful for distinguishing among the different salmon species, which three statements must be true?