How did stromatolites contribute oxygen to the early atmosphere? through photolysis

through methane degradation

through photosynthesis

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.

What kinds of molecules can pass through the cell membrane without any problem?

Explain why scientists use the word dominant for certain traits.