<span>Molecular clock is a scale which uses a technique whereby evolutionary time for different life forms is deduced from the mutation rate of biomolecules. Biomolecular data used for calculations in order to come up with the prehistoric time scale normally uses nucleotide sequences for DNA or amino acid sequences for proteins.
Hence, in order to develop a molecular clock, one would need: a sequence of molecules, the rate at which changes occur in a type of molecule and how much total change has occurred in a type of molecule from different species.</span>
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Radial symmetry is the arrangement of body parts around a central axis, like rays on a sun or pieces in a pie. ... The two halves of a radially symmetrical animal may be described as the side with a mouth (oral side”) and the side without a mouth (aboral side
D, is the answer. If you take antibiotics more than you're supposed to your immune system gets used to it and it no longer works.
Ecosystems have living creatures A biosphere has water and no landforms
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Cause they are Metals that there weight is tons
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