The idea that skills we have acquired in life are inherited is known as Lamarckism, and although this was once a widely held belief it is now thought to be wrong.  Skills and abilities are most likely to have developed as a result of the environment you were brought up in, a case for nurture rather than nature.  There is some genetic data to suggest that certain abilities, like the ability to recognise ‘perfect pitch’, have a genetic component.  This wouldn’t mean you would be born with musical ability, but being able to reproduce music more accurately than most may make you more likely to decide to get into music, and develop your musical skills.

Not all sea mammals, such as whales, dolphins, seals and walruses, actually drink sea water, which begs the question where do they get their water?  We think these mammals get their non-salty water from the food that they eat, and they are able to extract that from the fish that they consume.  There are also other adaptations in their kidneys.  We can’t drink seawater because our kidneys cannot cope with that much salt.  Whales and dolphins have special kidneys, which can cope with such large salt concentrations.

Non Melanoma cancers (skin cancer which does not affect the melanocytes, or skin pigment cells) are by far the most common cancers in the western world.  It’s largely because the skin is the barrier which is protecting you from the environment.  Exposure to sunlight, if uncontrolled, could damage the DNA in your skin and give you cancer.  Other types of damage that could result in cancer include exposure to harmful chemicals.

Rates of Melanoma (skin cancer which does affect the melanocytes, or skin pigment cells) have nearly trebled in the last few decades, particularly among younger people.  This could be because people are taking holidays in the sun and using sunbeds, overexposing themselves to radiation over short periods.

Yes.  Even a healthy diet is unlikely to protect your skin in that way from intense exposure to ultra-violet radiation.