They show that there was an ocean over the plains long ago, and fossils are always used to elaborate on the history of life/how it developed.
Option B (Sudan)
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i think the answer would be "in both eastern and western hemispheres"
Answer:
Humans and most other mammals have two sex chromosomes, the X and the Y. Females have two X chromosomes in their cells, while males have both X and a Y chromosomes in their cells. Egg cells all contain an X chromosome, while sperm cells contain an X or Y chromosome.
Explanation:
