The NFiPA 704 system used a numerical value between ZERO and FOUR to indicate the level of hazard for that particular chemical
Explanation:(a) Was this an observational study or an experiment? Explain your reasoning. Experiment, because certain variables were controlled (he sets the screen brightness to low and then starts a movie) to determine if iPhones last longer if the screen brightness is set to low, and it proves the cause and effect relationship.
(b) What is the explanatory variable and the response variable? Response Variable- To determine if iPhones last longer if the screen brightness is set to low Explanatory variable- he sets the screen brightness of 10 of the iPhones to high and starts a movie, then the other 10 to low and starts a movie.
(c) Was a random sample used to collect the data? Yes- “he selects a random sample of 20 brand new iPhones”
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Humans belong in the chordata phylum because they meet on the criteria listed on the chart (multicellular, tissues, vertebrae). Each requirement for each phylum also applies to the categories on the right. Because humans are one of the most complex life forms, it only makes sense that we're in the most complex phylum.