Fiddler crabs are invertebrates. That means they do not have a backbone (that's made out of vertebrae). Does this mean they don't have a skeleton?

What is the m’naughten rule? how did this rule come into existence?

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?