How can carbon dioxide be considered a pollutant when it is a natural component of air?
a.
carbon dioxide is considered a pollutant even though it is a natural component of air, because it is harmful to all living organisms.
b.
carbon dioxide is considered a pollutant when larger concentrations than normal are present in the air as a result of human activity.
c.
carbon dioxide is considered a pollutant, because it forms harmful chemicals when mixed with other pollutants in the air.
d.
carbon dioxide cannot be considered a pollutant under any circumstances.

It is indeed answer choice B :)

Schools are being forced to embrace computers. unlike their "digital immigrant" teachers, these students are "digital natives", born into a world where technology is an integral part of everyday life. almost every student has access to a multitude of computers, laptops and tablet devices. it would be crazy to assume an assignment would  notbe written on computer in this day and age.many schools now have a 1-to-1 computer policy, and many districts and states in the united states have mandated computers or ipads across the state for every student,  including los angeles, the second largest school district in the country.but the thing is, when they tried it in la, it wasn't the success they hoped for. that's because the tablets weren't used as much as they expected. rather, it appeared there was a gap between the digital native's love of technology and their use of it in the classroom.this conflicted relationship with computers is also underscored by much of the literature on education. it is also highlighted in professional development and conferences such as  edutech.

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.