Javier is thinking about his childhood—how things were then and how they are now. Write two sentences comparing what Javier used to do and what he does now. Answer as if you were Javier.

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

Read the paragraph below and answer the question that follows. "andy was asked to speak in a school assembly about a fundraising opportunity for a fellow student who had recently been diagnosed with leukemia. andy's stomach hurt and his hands were cold. "steady man," he thought. "you can do this. it's for tim. he needs our ." andy could picture the students wanting to get involved. it occurred to him now that he wasn't just giving a speech. he had something worthwhile to say. which strategies did andy use to reduce his apprehension? select all that apply." be prepared. use muscle relaxation techniques. get experience. think positively. focus on communicating to the audience.

The platt amendment was a treaty that allowed the united states to build military bases in which country?