Crossing over.
the happens in the poo
villi
An infection occurrs.
Magma occurrs by rocks melting inside a volcano
Your spelling.
The running of the bulls occurrs during the Fiesta de San Fermin in the city of Pamploma, in the Province of Navarra. Pamplono is the capital of the province.
The mode is the number that occurrs most often.
lawyer vs banker
The phrase "the lord is" occurrs 159 times in the KJV bible.
the person lost motor function and his muscles paralised
Mostly older adults, but it occurrs in people who have HIV, since HIV lowers your immune system.
A "synthesis" reaction.