Why is it a good idea to substitute transitions for visual elements in a text?

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

Wich organism obtains its energy from dead or decaying matter

Archaebacteria use for movement. celia flagella pili cell walls