Which of the following may not have been possible without the presence of ozone in the atmosphere? Respiration may never have developed.
Oxygen may not have been able to accumulate in the atmosphere
Life may not have been able to move onto Earth’s land surfaces.
Photosynthesis may never have developed.

What are some characteristics of a free enterprise economy?

What is the difference between sex-linked traits and autosomal traits in humans? a. sex-linked traits can only be passed from fathers to sons, while autosomal traits can be passed on from both parents to offspring of any sex. b. sex-linked traits are passed on through the x and y chromosomes, while autosomal traits are passed on through the other 22 chromosomes. c. sex-linked traits only affect females, while autosomal traits affect both males and females. d. sex-linked traits refer to genes that are on the x and y chromosomes, while autosomal traits refer to genes on all 23 chromosomes.

What are some natural processes that represent physical and chemical changes?