6. Analyzing Relationships How would you argue against a claim that ferns from the genus Glossopteris evolved independently on separate continents or
were transported between continents that were not connected? Explain your answer

Iam pretty sure it is c. 2000 bce

Answer(a); // soil salinization and waterlogging;

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

It's probably because the earth is actually tilted and is not straight when orbiting the sun. that's why when it's winter here, it's summer in the southern hemisphere. in the wintertime in the northern hemisphere, it's colder here because it's tilted away from the sun and the southern hemisphere is tilted closer to the sun (i believe this is the case anyways)