When did prokaryotes arise

A major reservoir for oxygen is the atomosphere. Which of the following processes adds oxygen to the atmosphere?

A scientist develops a chemical that prevents golgi bodies from functioning. contrast the specific effects the chemical would have on human cell versus bacterial cells

Besides urea, what other compound must be available for the urease enzyme to break down urea?

The water cycle is a biogeochemical cycle that is a closed system. Which of these sentences describes a viable stage that occurs in the water cycle?

Imagine you want to use an enrichment culture to attempt to isolate individual species of cyanobacteria from Greenlake.

What is the 3rd trophic level called

Roberto is a teenager who is going out with friends to a movie. On the way back home, they decide to stop to grab some food. Roberto is health conscious. What kind of snack would you suggest? A. low protein B. calcium rich C. high calorie D.

What system takes the longest to develop in a fetus?

What does the word prudent mean? A. slow B. easy C. wise D. kind

Briefly describe the steps of protein synthesis