Youre not able to determine gender unless given that a specific trait applies to only one gender. The only thing determinable is that there are three striped kittens and one black kitten.
Actively transport molecules across the cell membrane
Metals are known to be excellent conductors of electricity, however some metals do not conduct electricity as well as gold, copper or sliver (examples of good conductors). Metals such as lead, mercury and alloys of iron, chromium, titanium and stainless steel do not conduct electricity as good as silver, copper and gold. It is also important to note that all gases do not conduct electricity at all due to the great amount of space between its electrons.
The Answer is The Ear Drum