How have paleontologists contributed to humans' understanding of the history of life? Check all that apply.

They created a record of life on Earth.
They grouped organisms by their similarities.
They grouped organisms by the period in which they existed.
They discovered that the first humans lived with dinosaurs.
They discovered that life has existed since Earth was created.

They created a record of life on Earth.

They grouped organisms by their similarities.

They grouped organisms by the period in which they existed.

Explanation:

hope I helped enough

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

more than 65,000 union soldiers had been killed that summer.

more than 65,000 union soldiers had been killed that summer.

more than 65, is the correct