Vatican city is considered an enclave because it is
a.
completely surrounded by rome, italy
b.
geographically separated from the mainland of italy
c.
a self-governing region within another state
d.
occupied by the roman catholic church

Vatican City is considered an enclave because it is completely surrounded by Rome, Italy.

Explanation:

The State of the Vatican City is a country in Europe. This is the territorial support of the Holy See enclosed in the Italian city and capital, Rome. In 2019, it has 799 inhabitants over a total area of 0.439 km2, making it the smallest state in the world.

The Vatican is an absolute monarchy, of divine and elective law led by the Roman Pontiff and bishop of Rome, that is, Pope Francis, elected March 13, 2013, following the renunciation of Benedict XVI, February 28 of the same year. The pope sovereignly exercises the triple executive, legislative and judicial power of the state.

the wrong statement is - c. a desert had more biodiversity than a marsh.

the deserts are one of the places of the planet where there's the least biodiversity. the reasons for that are the climate and the lack of food sources, which hampers both the number of the species that can survive in it, and the number of the individuals in the species itself.

the marshes, on the other hand, are places where there's perfect conditions for lots of organisms to thrive. the temperature is moderate and nice, the amount of water and the food sources are on a high level, so there's an abundance of both plant and animal life in them.

figureit out

explanation:

because scientists need to know the stars so they understand space