Which sequence represents structures organized from least complex to most complex?

1.

nerve cell → nucleus → nervous system → brain
2.

nucleus → nerve cell → brain → nervous system
3.

brain → nervous system → nucleus → nerve cell
4.

nervous system → brain → nerve cell → nucleus

Which state of matter has the following physical properties: ~ takes the shape of the container it is in ~ takes the volume of the container it is in ~ low density. answer is gas

Drag the tiles to the correct boxes to complete the pairs. not all tiles will be used. match each type of organism to a characteristic that describes it.

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?