A) is your best answer.
Relative Dating gives the 'relative dating', which allows one to find the difference of age between many different of fossils. However, radioactive dating is used to get a more exact measurement of a fossil, but it can only be used for certain types of fossils.
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Answer:Is D-The placenta begins to form
Comparing and contrasting a compound light microscope, basically both operate by bouncing tiny particles or waves off of objects in order to make them visible. Electrons are smaller than light photons so we can see smaller objects clearly with electron microscopes. There are disadvantages though. First, color is a function of light wave frequency so we can't see electron micrographs in color. Color can be added artificially though by computer to differentiate structures, (think photoshop). Also, we cannot see electrons so we make them visible by bouncing them off a cathode ray screen similar to a TV set or computer monitor
Answer:
c is the correct answer of these questions
"Gene families are groups of <span>homologous </span>genes that arose by gene duplication and sequence evolution."
Gene families are groups of various similar genes that are originated mostly by duplication, but also by evolution and relocation. These genes are distributed<span> into families taking into account shared nucleotide or protein sequences. </span>
