manyah7470 manyah7470

04-03-2019
Biology

contestada

Before there was life on earth, which gas was absent from the ancient atmosphere?

A. ammonia
B.methane
C .nitrogen
D. Oxygen

Respuesta :

ash34321 ash34321

04-03-2019

D oxygen there was no free oxygen on the earth

Answer Link

ACCESS MORE

Otras preguntas

Although farmers have a number of ways to raise young fish, most are grown in earthen ponds. separates items in a series separates coordinate adjectives

Both E. coli and Salmonella are single-celled organisms. They do not have a nucleus or other membrane-bound organelles. Based on the concept of domains, what do

How did the colonists respond to the unfair British system of mercantilism? A: They began to source more agricultural crops for business. B: They began to chang

What z-score value separates the top 10% of a normal distribution from the bottom 90%??

A student's saving account has a balance of $4900 on September 1. Each month the balance declines by $350. What is the slope

The emerging consensus among contemporary researchers is that stress is

Calculate the maximum volume of a box that has no top and that is to be manufactured from a 30 inch by 20 inch piece of cardboard

One species of fish feeds in the muddy bottom of a lake. a second species eats insects that land on the water surface. this is an example of

In order to solve the following system of equations by addition, which of the following could you do before adding the equations so that one variable will be e

A shipment of sugar fills 223 containers. if each container holds 217 tons of sugar, what is the amount of sugar in the entire shipment?