Diagnose: a chromosomal disorder occurs when a person's cells do not have the correct
number of chromosomes. the table below lists three common chromosomal disorders.
disorder
description
subject
symptoms
down
syndrome
extra
chromosome 21
klinefelter
syndrome
extra x in male
(xxy)
turner
syndrome
single x in
female (xo)
use the table to determine which disorder subject c has. record your diagnosis in the third
column of the table, and then click on the diagnosis tab to check your answer.
summarize the information on the diagnosis tab in the fourth column of the table.

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: 4

explanation: 8

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.