20. Played a major role in the formation of the modern earth's atmosphere. (5 Points)
Photosynthesis
Respiration
Both

The answer would be both

Explanation:

It is both because photosynthesis gave oxygen and respiration gave carbon dioxide that created a life cycle for plants and animals on earth! Have a great day and I hope this helped :D

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;