B. Group number
For example, Sodium(Na) is in Group 1 and Na^+ has a charge of +1.
The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago.
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the umbilical cord is connected to both the mother and the unborn child and so tranfers nutrients from the mothers blood to that of the baby's blood
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<u>C. the types of cells and the tissues in which they can be found in a plant.</u>
<span>In order for the muscle fatigue to end the muscle cells must be provided with oxygen to 'burn' the lactic acid.
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-Payshence xoxo</span>
