The first is gene sequencing. This allows the sequence of nucleotides on DNA of different organisms to
be identified. The sequence is then compared the bigger the difference in this sequence,
the stranger the organisms are with regards to the evolutionary relationship.
<span>The second is
carbon dating. This enables anthropologists
to determine the age of fossils by calculating the time taken, in half-lives,
by particular elements to decay, such as carbon-14 </span>
Multicellular organisms need specialised organ systems, whereas all the life processes in a unicellular organism take place in that one cell. Multicellular organisms need organ systems to carry out functions such as: Communication between cells, eg the nervous system and circulatory system.
