Karen has 47 chromosomes but no apparent abnormalities. What is true about Karen? O A. She has aneuploidy.
O B. She has monosomy.
O C. She will die young.
OD. She has a cleft palate.

A. She has aneuploidy.

Explanation:

remember doing this a while back, got it right.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.