The original atmosphere of Earth is thought to have been rich in

a. CO2, N2, H2, H2S, and CO.
b. CO2, N2, O2, Ar, and Ne.
c. CO2, N2, O2, Rn, and Ne.
d. CO2, N2, H2, Kr, and Xe.


Ans: a. CO2, N2, H2, H2S, and CO.

Biology & Microbiology

You might also like to view...

_____ occurs when a cloned gene recombines with the normal gene on a chromosome to create a genetically modified organism (GMO).

A. Gene replacement. B. Gene knockout. C. Transfection. D. Transformation. E. Infection.

Biology & Microbiology

What is the maximum number of electrons that can be housed in the 1st orbital shell?

a. 3 b. 2 c. 1 d. 5 e. 4

Biology & Microbiology

What is the role of the cap on a sperm's head?

a. It provides directional guidance for sperm in female reproductive tract. b. It provides motility for sperm. c. It provides energy for sperm. d. It provides enzymes to digest outer jelly coat layer of oocyte. e. It provides enzymes to digest sperm body to release nucleus.

Biology & Microbiology

Which of the first three statements about

independent assortment is NOT true?

a. genes on homologous chromosomes assort independently b. genes on the same chromosome that are far apart tend to assort independently c. genes close together on the same chromosome tend to assort independently d. all of the first three statements about independent assortment are NOT true e. one of the first three statements about independent assortment is NOT true

Biology & Microbiology