Answer: D is you answer.
Explanation: Because earth first atmosphere had very little oxygen to support life.
Answer:
Well first u gotta find out what ph mean
Answer: Atomic masses increase as the atomic numbers increase.
Explanation: Elements are arranged in the periodic table in increasing order of their atomic numbers. A periodic table is a table showing the arrangement of the elements in the increasing order of their atomic numbers. Atomic number of an element is the number of protons in the nucleus of an atom while atomic mass of an element is the sum of the number of protons and neutrons in the nucleus of an atom.
Atomic number of elements increases across the period from left to right and increases down the group and the atomic masses of the elements increase from left to right across the period and down the group as the atomic number increases.
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a. the Human Genome Project. HGP or Human Genome Project's goal is to sequence all chemical base pairs of the human DNA. </span>This scientific research project has revealed that there could be an approximate of 20,500 human genes.