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A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane.

An infectious disease caused by a coronavirus that was discovered in 2019.

When the muscles of the uterus tighten and then relax.

A manned entrance usually at a border where security checks are carried out.

Cold is the presence of low temperature in the atmosphere.

A group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body.

A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane.

An infectious disease caused by a coronavirus that was discovered in 2019.

An official count or survey of a population.

A type of mild traumatic brain injury resulting from a blow or hit to the head that causes the brain to move rapidly back and forth inside the skull.