Scientists have divided the ocean into five main layers. These layers, known as zones, extend from the surface to the most extreme depths where light can no longer penetrate. Consider the map of the ocean's zones, formulate a
hypothesis regarding life forms as you move from the epipelagic to the hadalpelagic zone.
A)
Primary producers change from photosynthetic organisms in the epipelagic
zone to chemosynthesizers in the hadalpelagic zone.
Marine life decreases with depth, both in abundance and biomass, until we
reach the hadalpelagic zone, where no life exists.
B)
C)
As one moves from the epipelagic zone to the hadalpelagic zone. life forms
increase in size to accommodate the huge increases in pressure.
D)
We see much biodiversity in the epipelagic zone, including flowering
plants and vertebrate animals but in the hadalpelagic zone, only bacteria
exist.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

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