<span>The building from the list provided with the highest likelihood of air pollution is a tightly sealed house with an unvented water heater. The school with leaks will let air exchange happen so that isn't it, and having a carbon monoxide detector only reports existing air pollution it doesn't prevent air pollution, it could have issues but we don't know. The tightly sealed house with the unvented water heater is a near sure thing.</span>
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
I think the answer would be A , break the darkness period with a flash of light for some time so that the plants can bloom all year round.
<span>Planets closest approach to the sun is associated with the term perihelion. </span>
A. Phenotype.
Genotype is the genetic constitution of an individual organism, genetic makeup is part of the DNA sequence, and personality is the way a person acts.