Before there was any life on earth, which gas was absent from earth's ancient atmosphere?

A. nitrogen

B. ammonia

C. oxygen

D. methane

Which one type of analytics would be used to analyze hospital readmission rates for heart failure? a. opportunistic b. descriptive c. predictive d. prescriptive?

What is added into the small intestine to emulsify dietary fats?

Which of these elements has the most chemically non reactive atoms neon iron lithium bromine

Water sticking to a blade of grass in the morning would be an example of which of the following? - cohesion - adhesion - high specific heat - high heat of vaporization

Which process can be found in both bacteria and protists?

How can biotechnology decrease or increase variation?

Photoperiodism and flowering use the data in the table below to determine whether each plant is a short-day plant, a long-day plant, a day-neutral plant, or a plant that cannot be classified based on the data. description plant a plant b

The alkali metals make up which group of the periodic table?

What is the most important mechanism through which combined oral contraceptives prevent pregnancy?

You are making CO2 production measurements on hovering hummingbirds in Peru and assume they have fed on floral nectar recently (glucose), but in fact, they have not fed in the last hour and are metabolizing fat;