Biology
In which phylum nerve cells are found but nerves are absent ?

Porifera
Nemathelminthes
Platyhelminthes
Coelenterata

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Biology
Ozone hole refers to

increase in the thickness of ozone layer in troposphere
decrease in the ozone layer in troposphere
decrease in thickness of ozone layer in stratosphere
hole in ozone layer

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Biology
Which statement concerning the diagnosis of ADHD is true?

About 20 percent of school-age children are diagnosed with ADHD
Most children "outgrow" symptoms of ADHD
Racial minority status is a good predictor of being diagnosed with ADHD
Boys are more likely to be diagnosed with ADHD than girls

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