hunNikkidNanaK hunNikkidNanaK

12-11-2015
Chemistry

contestada

Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.
A. lead
B. hydrogen
C. oxygen
D. ore

Respuesta :

12-11-2015

Ancient cyanobacteria released hydrogen which assisted in creating the atomsphere as we know it today.

Answer Link

Otras preguntas

A student with a weight of 543.0 N runs up three flights of stairs. The student has gone a vertical distance of 7.1 m. Calculate the work the student did while

Can water ever be a solid over 0 °C? a. Yes, if the pressure is high enough. b. No, it can never be solid over 0 °C.

why is it that volmeter has extremely high resistance

in your job as a mechanic, you spent from 7:45 A.M. to 8:05 A.M. changing the oil in two vehicles. At this rate, how many vehicles can be completed in a 6 hour

To estimate the total load for a dwelling, the ____ of the dwelling must be calculated. a. excess storage b. living c. occupied floor area d. unoccupied rooms.

In Mozart's Symphony No.21 First movement. How does Mozart modulate to the second key area? Specifically, where does the bridge start, and how it is structured

Kyle is interested in examining how sex of participant (male, female) and self-esteem (high, low) affect perseverance on a novel task. What is the dependent var

what is the probability that a randomly selected multigenerational family is White, given that it is a "skip" generation family?

{3x + 6y = 0 {x + 2y +=0 They are supposed to be connected under one symbol but I can't type it out like that. I believe this type of problem is called "syste

According to the law, which of the following conditions must exist before you can make a felony arrest?a) The felony must have been committed and you have reaso