Oxygen gas (O2 ) was a major component of Earth’s first atmosphere

Which piece of evidence supports the endosymbiotic origin of mitochondria?

A dichotomous key is used to:

Which of the following is a characteristic of the plasmodial slime molds?

List the taxonomic levels in order from most inclusive to least inclusive:

A nurse is caring for a client who has hypertension and has been prescribed hydrochlorothiazide (HCTZ). The client asks how this medication will help manage their condition. Which of the following responses by the nurse demonstrates an understanding of the therapeutic effects of hydrochlorothiazide (HCTZ)?

Nitrogen fixation, the conversion of N2 to NH3, is an ecological service provided primarily by:

In a cladogram, a “node” represents a common ancestor shared by the descending clades.

Michael, a 19 year-old male, presents to the clinic with a complaint of diffuse lower abdominal pain that has progressively worsened over the last few days. He states that he has experienced nausea and vomiting as well. The next step in the health assessment process would be to:

 Cyanobacteria are responsible for the “Great Oxygenation Event” in Earth’s history.