True or false boron carbon and nitrogen I have the same valence electrons

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.