Past tense because the verb isolated is written that way.
They stress Columbus's determination and fearlessness.
https://quizlet.com/_6iyhcg
Her pee lol jk but you need to eplain it more
Answer:
People have and still are affecting the environment by littering. We also don't recycle as much as we should. We are greatly contributing to the destruction of the ozone layer. Fossil fuels hurt the environment. Even water pollution and deforestation is caused by us.