Why is it difficult to diagnose genetic conditions?

The main reason it can be hard to reach a diagnosis is simply because a disease or disorder is so rare that it is unrealistic for a doctor to be familiar with every one of the thousands of rare conditions. Another reason that it can be difficult to diagnose a rare disease is because many of these conditions are genetic.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

air, water, heat and noise pollution can all be caused by producing and using technology. consuming resources - non-renewable resources, including precious metals like gold, are used to make technology