A eukaryotic cell can replicate itself two ways. Hope this helps!
It is number 1 because enzymes are always being consumed.
If two homozygous plants with contrasting traits are crossed, the
expected genotypes for the offspring will be heterozygous. The
dominant trait would be expressed, but they'd be carriers for the
recessive trait.
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Around 4.1 billion years ago the first single celled organism appeared
