Which area of the graph shows the activation energy required if an enzyme was not present

What is it called when plants lose water though their leaves

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u. s. and mexico. the st. lawrence seaway provides an important trading route for the u. s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?