Describe two events in embryonic and fetal development that happen in each trimester of pregnancy

When two movable joints meet at a joint, their do not touch one another.

In multiple sclerosis, the immune system destroys the substance that coats and protects nerve fibers in the brain and spinal cord. this causes inflammation and injury to the nerves, and the axons don't conduct impulses as well.

An is a record that contains a list of qualified workers in an industry.