How many birds are there?

if your taking about species then there are about 18,000 bird species

Explanation:

200-400 billion individual birds, and 10,000- 13,000 species of birds as of 2020.

Explanation:

darwinism is survival of the fittest there for social darwinism is the survival of the wealthiest

i believe the answer is the last option, the magyars preferred to invade by land.

i hope this ! : )