The chart below shows some events in earth's history and the primary sources of information which were examined to date the events. earth event marine animals appear fuel sources appear mammals appear ferns appear primary source of information history books fossil in rocks green plants root structures which of these earth events was dated using the most valid and reliable source of information? marine animals appear fuel sources appear mammals appear ferns appear

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus

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