What is difficult to determine in the process of adaptation unless there is a closely related species to which you can compare findings?

it is difficult to determine
in the process of adaptation unless you can compare findings of one species to a closely related species.

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units:

All cells are made of four types of acids, lipids, proteins, and carbohydrates.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?