Cyanobacteria pumped this into the atmosphere, creating an ozone layer.

Nitrogen

Oxygen

Methane

Ammonia

Does the salary of an occupational therapy assistant vary by which part of the country you work in?

A zebra migrated to join a different herd of zebras increase or decrease

List the substrate and the subunit product of amylase

What has occurred when a solid forms out of the mixing of two liquids in a chemical reaction?

Which is a part of the cell theory? which is a part of the cell theory? cells come from pre-existing cells cells have a nucleus organisms with one cell must be seen with a microscope organisms must have more than one cell to live

What are the distinguishing features of club mosses, whisk ferns, and horsetails? how are these plants different from ferns?

The nursing instructor is presenting a class on the various classifications of twins. The instructor determines the session is successful after the students correctly choose which classification that indicates twins have separate amniotic sacs and

What internal conditions contribute to global climate change?

Where do producers store their energy

Why can't a virus reproduce on its own? will give Brainliest